Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d79a7ded04a0f8…

MALICIOUS

PDF

86.8 KB Created: 2021-06-04 01:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd5d4d29b187e1c50fee1d8f6c383fb4 SHA-1: da0575613f8cdd02b96757a18c870ec36f71f69f SHA-256: 16d79a7ded04a0f83ad001fd2266c22a526ffaa24f0581f9316eaaff76e02662
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm or a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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
  • 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://allytemp.ru/pbw?utm_term=como+descobrir+a+senha+do+wifi+no+android+%2528conex%25C3%25B5es+salvas%2529+2019
    • https://cdn-cms.f-static.net/uploads/4451927/normal_5fda3ab07c70d.pdf
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/9e77a53f62ec00.pdf
    • https://cdn-cms.f-static.net/uploads/4499972/normal_600b5b69168f2.pdf
    • https://vixoketos.weebly.com/uploads/1/3/1/4/131453026/piregekafogev.pdf
    • https://cdn-cms.f-static.net/uploads/4367297/normal_6054aaec8fd5c.pdf
    • https://cdn-cms.f-static.net/uploads/4475391/normal_604cf16ae1a42.pdf
    • https://cdn-cms.f-static.net/uploads/4454825/normal_60602c74116e9.pdf
    • https://cdn-cms.f-static.net/uploads/4370054/normal_604ecfda997a4.pdf
    • https://static.s123-cdn-static-d.com/uploads/4378164/normal_60b5be49d6874.pdf
    • https://cdn-cms.f-static.net/uploads/4503390/normal_60304e7db3d2a.pdf
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/junonij.pdf
    • https://cdn-cms.f-static.net/uploads/4446636/normal_600dff2a1f91d.pdf
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/4466703d5e6a63b.pdf
    • https://cdn-cms.f-static.net/uploads/4374362/normal_6053e935e7645.pdf
    • https://buneresax.weebly.com/uploads/1/3/4/4/134478328/9570592.pdf
    • https://static.s123-cdn-static.com/uploads/4471235/normal_5fc79a9ca8ff2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://rukutuxeriro.pbworks.com/w/file/fetch/144577986/fedodamojejabudosomaruwi.pdf
    • http://tikomegeto.pbworks.com/f/27109761458.pdf
    • http://jeselivid.pbworks.com/f/56882756994.pdf
    • http://genarozep.pbworks.com/w/file/fetch/144527352/karnofsky_performance_score_0.pdf
    • http://mikabipi.pbworks.com/f/sesetunejekofoxema.pdf
    • http://siwuromo.pbworks.com/w/file/fetch/144425226/23324408424.pdf
    • http://pinurakus.pbworks.com/f/sifexukilumivabom.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d9.bin
ac247f513929b279798981c8c6d14057202d935452bcf1ae1a0501673aafbc69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 6380 bytes
font_01_sfnt_off0000fa44.bin
374e1bc11049e2750aa53ff29b446c0e843747e6ee03840a29de6d159c99b266		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 2316 bytes
font_02_sfnt_off0001042b.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 1800 bytes
font_03_sfnt_off00010cb9.bin
1a58cfea197db0332700c90106c0cdadd29186700005efff6f1f100402717ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 12604 bytes
font_04_sfnt_off000133fb.bin
9fb27deccb73073cf2b299f7caa3410aa3755f2de102bbdc4c87e9aa69464f54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133FB 16200 bytes

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