Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cc47fd8436d6fa…

MALICIOUS

PDF

100.5 KB Created: 2021-05-06 03:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68ba3131c13c96dab04ab43a78ef4fc0 SHA-1: 95cfe02bb3922f07adc9ee8521514856eaf9ce7c SHA-256: a1cc47fd8436d6faf8d4d398aea6f8ba60de75bd280e7b8914acbbbe38390ab2
186 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, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+is+the+conductivity+of+nacl
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/pugukesapojomowanak.pdf
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/4214701.pdf
    • https://sizuzevejej.weebly.com/uploads/1/3/3/9/133997482/bexapopa-levamoxe-nesek.pdf
    • http://lozejebivo.scienceontheweb.net/51484504883.pdf
    • https://doguxugufini.weebly.com/uploads/1/3/0/7/130739878/latilasogese.pdf
    • http://sivelural.mygamesonline.org/attestation_sur_l_honneur_vierge.pdf
    • https://cdn-cms.f-static.net/uploads/4421615/normal_6010ace9b32c3.pdf
    • https://static.s123-cdn-static.com/uploads/4460477/normal_5ffd99d5f158c.pdf
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/nifanaponexufi_dopigafiwikazak.pdf
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/2073708.pdf
    • https://xujesosa.weebly.com/uploads/1/3/6/0/136090165/kofujikikamulaz-lefipumop.pdf
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/85a4e5c9a8.pdf
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/4864124.pdf
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/mudire.pdf
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/kokutukupib_jetomawi_gejaluvilogi.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5fe9cc0f1e27a.pdf
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/vomemaxelozem-sajijomawex.pdf
    • https://zijubanefim.weebly.com/uploads/1/3/4/3/134349059/lufolidegafo-mapowudum.pdf
    • https://static.s123-cdn-static.com/uploads/4421471/normal_6000344e2b10d.pdf
    • https://cdn-cms.f-static.net/uploads/4463266/normal_6049cbb1666fe.pdf
    • https://zodovamerevi.weebly.com/uploads/1/3/4/3/134316438/dojajotozotidik_vogeliw_gijepob_mukuwavexivede.pdf
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/de1b4331bb.pdf
    • https://nuvaxavixo.weebly.com/uploads/1/3/0/7/130738964/resamuragavusigogeti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luxupovokajaf.onlinewebshop.net/budismo_japones.pdf
    • http://zevusup.atwebpages.com/51766117291.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_off000130bc.bin
7ad1d529fadbaa6a76ea16d16467b5af5b36ada3d4a62896ff6beb391dfa40c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 5188 bytes
font_01_sfnt_off0001427b.bin
23f9d6d5a76dc8e3a7bff1e0cffa68749d7b7e5ad214d2df4adc27c3026f02e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1427B 13460 bytes
font_02_sfnt_off00016ea2.bin
eb9e00d91bfcd7b0710b2dc1eaa08832ffd5d3ff695e68df76ca92bdf348c3cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA2 16280 bytes