Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8f22acc675dd40…

MALICIOUS

PDF

127.0 KB Created: 2021-03-13 20:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1953d7c81bb044bc57ff48f4710b6fb8 SHA-1: 341a20ffda4c9d3629ff96430dace1f07d7e62cb SHA-256: 8a8f22acc675dd40e93b7d65334887cdb586fbeaaaf51d5a484d5cb92d3d7adb
196 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of an advance-fee scam, as indicated by the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic. It contains numerous external links, with one prominent URL pointing to 'dafemum.ru'. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://dafemum.ru/strik?utm_term=why+did+the+manson+family+do+it
    • https://cdn-cms.f-static.net/uploads/4487419/normal_602ff64248742.pdf
    • https://cdn.sqhk.co/dukosisevu/bc7SEmb/vodijiro.pdf
    • https://dujezipiver.weebly.com/uploads/1/3/4/6/134610991/rimawaraxo_pajotawimoberu_varugemexexo_dipovoto.pdf
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fde193384511.pdf
    • https://cdn.sqhk.co/rorezina/jaDhdhj/32583675710.pdf
    • https://static.s123-cdn-static.com/uploads/4460450/normal_5ff24fc352024.pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_603e1b0276088.pdf
    • https://cdn-cms.f-static.net/uploads/4409118/normal_604ca793ab847.pdf
    • https://cdn-cms.f-static.net/uploads/4491152/normal_6021f722526a9.pdf
    • https://jitonugen.weebly.com/uploads/1/3/4/6/134617549/9064367.pdf
    • https://cdn.sqhk.co/fujonexa/bPwxig0/slick_slime_sam_barbie_doll_clothes.pdf
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fc5f7f90704e.pdf
    • https://static.s123-cdn-static.com/uploads/4381547/normal_5fc7c03615dcb.pdf
    • https://static.s123-cdn-static.com/uploads/4449410/normal_5ff0470e626a1.pdf
    • https://cdn.sqhk.co/remezebona/OGMji5z/39483332283.pdf
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fd1443c1ed9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zoxewudunigus/android-_file-_transfer_ubuntu_ppa.pdf
    • https://s3.amazonaws.com/lemerisinivum/reragabi.pdf
    • https://s3.amazonaws.com/mulerux/bobobo-_bo_bo-_bobo_anime.pdf
    • https://s3.amazonaws.com/bubisifapagefe/consulting_receipt_template_word.pdf
    • https://s3.amazonaws.com/tikoweravisixu/4228130745.pdf
    • https://s3.amazonaws.com/wuniku/cambridge_english_empower_b2.pdf
    • https://s3.amazonaws.com/leteraxewe/xazebamuti.pdf
    • https://s3.amazonaws.com/kigavanus/rifirola.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b61c.bin
1c072af20d6247aa544239fba19a344fc500aa8d87ff7657a13a2d6e0e36389e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B61C 5168 bytes
font_01_sfnt_off0001c79e.bin
bad1a537f0f1f0d742e2b1c56aeab6618c44b38998d643231ebc00a163a5bce2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C79E 11648 bytes