Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04af187d79b6938…

MALICIOUS

PDF

99.3 KB Created: 2021-04-15 23:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72dba0a3de77891ed21e3778f748bd98 SHA-1: 7ad6a0bb3becc796abda675b76c91409c776d924 SHA-256: b04af187d79b693836123c1ac437d0dba30b42b7427a2259f01c07f3efe3699d
226 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, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's purpose is to deceive users with promises of prizes or funds, requiring them to interact with the provided links. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing and social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://fokemale.ru/strik?utm_term=the+chaser+short+story+audio
    • https://kifewaremavej.weebly.com/uploads/1/3/1/6/131606874/6c2f3671b26.pdf
    • https://jagofejejo.weebly.com/uploads/1/3/4/3/134341531/vubavefurelorug_faputuvekova_xobokefamiron.pdf
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6023f09cb1480.pdf
    • https://cdn-cms.f-static.net/uploads/4406501/normal_6056066768b6e.pdf
    • https://ropifupagefe.weebly.com/uploads/1/3/4/5/134584424/698c36.pdf
    • http://vasizazesunof.medianewsonline.com/micro_irrigation_system_design.pdf
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/fd3f53a7f2a5760.pdf
    • http://fuvesozufinefi.medianewsonline.com/67253589567.pdf
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/6ab581d26.pdf
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/968234.pdf
    • http://lipuwisapi.mywebcommunity.org/sadixiperonenune.pdf
    • http://roxelejabojafe.scienceontheweb.net/gerokitafagedifidesuf.pdf
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/1240193.pdf
    • https://makumanufomogo.weebly.com/uploads/1/3/0/8/130874647/mafanedutavo-bunebelivij.pdf
    • https://bumekutuwa.weebly.com/uploads/1/3/1/4/131452846/kesomemivexulev-teseba-libotu.pdf
    • http://tipofeliluget.medianewsonline.com/31268077280.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pojikovewijeja/34895599719.pdf
    • https://s3.amazonaws.com/vufupu/42747893030.pdf
    • https://s3.amazonaws.com/tuletivotarupu/microsoft_windows_server_2016_license_guide.pdf
    • https://s3.amazonaws.com/guxosa/58264497007.pdf
    • http://pimoxonevuwewax.atwebpages.com/46794541214.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/16943731312.pdf
    • http://wutejaxevewef.myartsonline.com/80164112692.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013408.bin
2554a0e3032f219615c7a3207db08dfb3243e17db62fc052519efd635b368197
pdf-font-stream PDF embedded font (sfnt) at offset 0x13408 5044 bytes
font_01_sfnt_off0001452f.bin
3a20e471307aab2e6f2579715820381350e1b152ad35019763d299b8d2758c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1452F 11260 bytes
font_02_sfnt_off00016b1f.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1F 16060 bytes