Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4845bb4bc9bef7…

MALICIOUS

PDF

78.2 KB Created: 2021-06-11 03:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ca3617e76f96b5fe0fe0c97837510810 SHA-1: aa2fedadd4f6e5bfed1cd503f59f3817c90d5275 SHA-256: ab4845bb4bc9bef761319fad2b31208db7e754cde63f2c4ba04abf022b967cf6
226 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm designed to redirect users to potentially harmful content. The document contains numerous external links, many hosted on disposable domains, suggesting an attempt to obscure the ultimate destination or to distribute a payload. The presence of a 'Password-protected archive lure' heuristic indicates that the document may be part of a multi-stage attack, where the user is instructed to download an archive that requires a password, likely to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/pbw?utm_term=pokemon+white+2+download+drastic PDF link annotation
    • https://rimuzunij.weebly.com/uploads/1/3/4/0/134095873/topazugojirew_zajijalefewop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_602eaba1bca12.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/454725.pdfIn PDF document text
    • https://xusezazidajitov.weebly.com/uploads/1/3/5/3/135325201/xerajigexoj_kumuteb.pdfIn PDF document text
    • https://figuxola.weebly.com/uploads/1/3/7/5/137517110/4189345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446944/normal_600020df73033.pdfIn PDF document text
    • https://bedimeni.weebly.com/uploads/1/3/4/0/134016729/wevunijekij.pdfIn PDF document text
    • https://vipofobusaxipol.weebly.com/uploads/1/3/4/2/134234766/nupuvijixebug-gepida.pdfIn PDF document text
    • https://govenovu.weebly.com/uploads/1/3/4/7/134701044/6ed0b1bfb57b00.pdfIn PDF document text
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/tezijadaxakukugew.pdfIn PDF document text
    • https://duwolawegowogip.weebly.com/uploads/1/3/4/7/134704708/3975998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_60bc4d2e60091.pdfIn PDF document text
    • https://xowanejizaki.weebly.com/uploads/1/3/1/8/131871556/keruzuvawitenu_meteweju_gipedurutarug_roxijibinuko.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/9011250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_604adabeae8dd.pdfIn PDF document text
    • https://fudiribaka.weebly.com/uploads/1/3/4/7/134714876/piwif.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/695709fc-9a5b-401a-80ac-9c257725877d/how_do_you_install_an_integrated_dishwasher_door.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b43c65-1683-4ac8-bef1-b440e3e0ee6d/how_to_measure_charles_tyrwhitt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2726d454-484d-4a43-b8cd-84308f769301/30474865526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b705a81c-0176-4cce-aee9-8044b7a85958/60378228394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be193aab-a0de-46a0-b904-9ec09006c818/61035904687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72874ceb-f9f3-4cff-811d-306bb9bacccb/74663373106.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 5468 bytes
SHA-256: 61b6da76f2a5003a3f96581adf8deb0140f4f16dd6a42ea633c6bed16c2ea390
font_02_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 11892 bytes
SHA-256: bcfb15e649d86b052c968bd18e1320d0e2caa27160d5d86eeecfdda1262345c1

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