Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef1b650a04cd74d…

MALICIOUS

PDF

100.6 KB Created: 2021-04-17 15:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2552fb275c52dba61166b3753eeeab08 SHA-1: 4cc6b33c3e7b7363dbe0cf8e44dd7742c6c7a4c4 SHA-256: 6ef1b650a04cd74dee472ad99dbc449db3482d9819e4ef254a4fec329cf19983
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=ancient+india+vocabulary+builder+answer+key PDF link annotation
    • http://goldstein.capital/661921592138vgbp.pdfIn PDF document text
    • http://habercigo.com/netafubi8i1br.pdfIn PDF document text
    • http://chelamela.org/best_inspirational_life_booksreh2v.pdfIn PDF document text
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/2662654.pdfIn PDF document text
    • http://item-mask.top/the_alchemyst_secrets_of_nicholas_flamel_film54f49.pdfIn PDF document text
    • http://vovpomnim.ru/fender_hot_rod_deluxe_amphqv3e.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/c238466ce873.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/eKqghhJ/litujebigetep.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/fefb9c01.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/98294802802.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/379258.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/ab5ieef/final_fantasy_xiv_free_trial.pdfIn PDF document text
    • http://datingdate.site/12_step_program_for_drug_addictionu4ncn.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/les_cathares.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/loxujavifiwexoxugoge.pdfIn PDF document text
    • https://nefikeroliv.weebly.com/uploads/1/3/1/4/131453179/1474282.pdfIn PDF document text
    • http://in-step.shop/vifuwibuaotn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesuposobevexo.rf.gd/ferivipirowinufamigej.pdfIn PDF document text
    • http://tojizevujodi.rf.gd/adaptive_behavior_scale.pdfIn PDF document text
    • http://bifapekedareb.rf.gd/bafikomotizuzakini.pdfIn PDF document text
    • http://vupifokixen.rf.gd/subinefibiket.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C51 5380 bytes
SHA-256: cf940048d95f57da81cb4fc558b8cbcc5b2abd3dfb4a6d91bc2d11aa085360b0
font_01_sfnt_off00015ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC5 11184 bytes
SHA-256: 142ff8bcd2ab598e27ab7e3217ef3742a497c219b8872f465cec3a9ddb2741b5