Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc754aa1d46f46f6…

MALICIOUS

PDF

82.0 KB Created: 2021-05-23 00:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8344f1275292482e5e73a94533837243 SHA-1: 990e7f1262cd459d32e6208e52703be078ef6f56 SHA-256: dc754aa1d46f46f61d0a5e7091c5d3db8473adf6e3ec8796d46277a44698e538
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to various websites, many hosted on disposable domains like weebly.com. The primary purpose appears to be directing users to potentially malicious content or phishing sites, indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. No scripts were extracted, but the extensive use of external links suggests a phishing or malware distribution vector.

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://resalured.ru/strik?utm_term=harbor+breeze+remote+a25-tx013+programming PDF link annotation
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/ee869c2a5.pdfIn PDF document text
    • https://bevoparekev.weebly.com/uploads/1/3/4/0/134018333/dudoleku.pdfIn PDF document text
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/819885b01a.pdfIn PDF document text
    • https://kudojiluro.weebly.com/uploads/1/3/4/4/134441165/domif-novedopuduk-bumewokuti-xapapibawob.pdfIn PDF document text
    • https://dafozadojav.weebly.com/uploads/1/3/4/7/134764431/lixuj.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/jisumotawasaw_kazuzijelos_bazowozazad.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/waxiralasaki-muxef-zulazomerilelig-logovuz.pdfIn PDF document text
    • https://buwumesuja.weebly.com/uploads/1/3/5/3/135303403/4033014.pdfIn PDF document text
    • https://rogixatig.weebly.com/uploads/1/3/5/3/135323026/5447296.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/2277268.pdfIn PDF document text
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/dikix.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/kebedelepi-didoreni-fafovewipo-pasotis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5fdc67e6b1464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_6063aaec2231b.pdfIn PDF document text
    • https://vasuxuduka.weebly.com/uploads/1/3/4/3/134322555/luxoloxonagus_kiperineze.pdfIn PDF document text
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/7452ae88b819af6.pdfIn PDF document text
    • https://butitonivo.weebly.com/uploads/1/3/4/3/134314214/dc00b4910b758cc.pdfIn PDF document text
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/fd0c36.pdfIn PDF document text
    • https://feravenokitaj.weebly.com/uploads/1/3/6/0/136095553/f20aa115.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/zilaf_xibisowujowove_walajixagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_6061ca65d894f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_6008e93c20c83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mulerux/android_bus_racing_games_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/definition_of_accounting_principles.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/borzoi_breed_information.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 5796 bytes
SHA-256: 2b8f875e1726841312b140e703f20ada742cc3f7bbaa9bd91486a382f9af27d0
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10052 bytes
SHA-256: 0346caac27cabd70cf34300dea0e1f7aab39b82defe8bb305426fe645bb15bd1
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 16196 bytes
SHA-256: 536551dee6876366cf8a5d925709f0aaa9c9f58e9963f4e154d0e8cf77de6ee3

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