Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cf7af8cc03ffc3…

MALICIOUS

PDF

79.3 KB Created: 2021-03-04 14:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 09d6987b117d41cb2290ec2816aca56c SHA-1: 7163c8dd08854e3cce8362d2bc7fba8d7acff534 SHA-256: b5cf7af8cc03ffc31b0d6b99b20d42d158a95aa0ff94abcb005785bf3c6ffb70
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/award?keyword=why+won%2527t+my+leaf+blower+start PDF link annotation
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/7199253.pdfIn PDF document text
    • https://topukutenikoxi.weebly.com/uploads/1/3/4/6/134668920/444807.pdfIn PDF document text
    • https://wigitofeza.weebly.com/uploads/1/3/2/6/132682623/zovita.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/jegedurowabatek.pdfIn PDF document text
    • http://tiktokfrance.fun/aberdeen_group_contract_management_benchmark_reportmmsgf.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/438a4af0d44b129.pdfIn PDF document text
    • https://fejuzewe.weebly.com/uploads/1/3/4/8/134883228/55692bc.pdfIn PDF document text
    • http://azules.ru/zevumepeguxekuzejr7wob.pdfIn PDF document text
    • http://questotzvezd.space/http_biologycorner._com_worksheets_controls._html_answers8rjp2.pdfIn PDF document text
    • http://gufutaca5.xyz/25599491586chlg2.pdfIn PDF document text
    • http://wordsideget.top/what_factor_affects_the_average_temperature_of_a_region8k0v6.pdfIn PDF document text
    • http://drnextact.xyz/fenix_2_not_syncing_with_garmin_connectl0zso.pdfIn PDF document text
    • http://3-bureaureport.info/area_and_perimeter_of_plane_shapes3slwb.pdfIn PDF document text
    • https://danivuvi.weebly.com/uploads/1/3/1/4/131407625/vemuve.pdfIn PDF document text
    • http://temilops.xyz/43507216385c6cbk.pdfIn PDF document text
    • https://gikexirubunos.weebly.com/uploads/1/3/4/6/134644737/3b873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2550db7-c8a2-480e-a99e-d2edc0caaf51/8839215557.pdfIn PDF document text
    • http://fixadamobus.epizy.com/cloud_9_sushi_half_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e950f4-5615-4325-bee5-b2242c654ffc/barrons_gre_high_frequency_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103c15f6-3bcb-47d9-a1e5-410c9c16ea2e/50478472450.pdfIn PDF document text
    • http://rimojiruseb.rf.gd/chrome_extension_links.pdfIn PDF document text
    • http://rozipiliwune.epizy.com/interesting_maths_puzzle_questions_with_answers.pdfIn PDF document text
    • http://pebeminozari.epizy.com/55170761635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd59600-6495-4836-bced-6572a8c5340e/66825537842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5c96af-c3e9-4568-8da5-d79dd105f9d2/177_mental_toughness_secrets_of_the_world_class.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 5388 bytes
SHA-256: 31c6ee5c0908d64a9d7ff1b878c2b665861a9f60afd029e67eb5355e81aa6f04
font_01_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 10412 bytes
SHA-256: aa9be135a628eb9ffc9c9d87200edee528c83c66dd1e242ef7558bcb47776a76