Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81a9f326eb40cb0…

MALICIOUS

PDF

88.4 KB Created: 2021-03-10 01:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1800f0df3b1ac65ba9d3c640e51bbe6b SHA-1: f137647f1caccc9464c3a318f5788d259aebfa79 SHA-256: b81a9f326eb40cb0141521a4b8d5e9d0b089834f5e17351eacdb944560500101
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a specific focus on disposable hosting and potential SEO manipulation. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to potentially harmful or deceptive content, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/123?utm_term=avermedia+live+gamer+hd+lite PDF link annotation
    • https://cdn.sqhk.co/bulegumu/hgOjiFg/49410290624.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/bxm5Dgd/89617557828.pdfIn PDF document text
    • https://cdn.sqhk.co/woragumokewi/heigjbe/ninja_rope_swing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/4fzgkiX/wibis.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/sjgje4j/38583765627.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/3Ijicjd/skin_for_roblox_download_apk_uptodown.pdfIn PDF document text
    • http://kidepokapila.22web.org/34259553630.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/iChfb09/business_calendar_2021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumonufagatoteb.epizy.com/brassage_informatique_en_anglais.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_445ebef7223547daa324d28e50150be9.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_2588452d8ac8447a91c3458e95d206d6.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_c0b1ae0d19774e94abb384890e080aaf.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_76c5f5ef86e740f78b0deb5cfc086230.pdf?index=trueIn PDF document text
    • http://kemeterotef.rf.gd/94097727354.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_d5dc783a7dc74b5886f557965215a83c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/409ab72d-bd77-4af7-8c58-4c3c1192d2fe/examples_of_domino_theory_of_accident_causation.pdfIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_e5835609ba04447eb0773efcf5249a32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ddc045-f425-4b0b-887a-4b739c1481e6/71474149872.pdfIn PDF document text
    • http://fokafupu.rf.gd/first_alert_co400_carbon_monoxide_detector_battery_operated.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_9b56e247a2f144ecae467ef71c2bd769.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eff9ae1-7ff5-4442-916a-450ca88113d1/97511257037.pdfIn PDF document text
    • http://jaxegowanav.rf.gd/25309083215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2513e203-a286-4505-9ebd-c291d94bed1a/little_nation_and_other_stories_summary_sparknotes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 3172 bytes
SHA-256: a4415aa22532fbc796726a52c994343eae34ff7b044b927c1ccc9b74e8ea1377
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 5112 bytes
SHA-256: 116c36e337ea70ebfce2237a856e468873fff4b7fee0d74288fa04868ccaf251
font_02_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 10908 bytes
SHA-256: 52ce3f60f89aebd0abefd1fae3c9970bab5104f02e27ec43d302b0a5dac24b78
font_03_sfnt_off00013cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAE 16572 bytes
SHA-256: 99d1059cefc4d04edae95cb2e3125d702aed451d6f7a2204211400ec0e1a267a

Open this report in the interactive analyzer, or submit your own file for analysis.