Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e7bceb863f2e62…

MALICIOUS

PDF

80.8 KB Created: 2021-04-01 17:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0255bf5fbce9a350435c3ff8231dce43 SHA-1: 9b890cd93ac7fd77c969695d176d9a93a5e4b6a9 SHA-256: 57e7bceb863f2e6212d88a32c64098bff6cfbce7e4af56e6b87b063c4fb3f2b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malicious content distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jumiwimov.ru/award?keyword=chaplet+of+the+holy+spirit+pdf
    • http://hr-insider.com/dotevixofet76fr.pdf
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5fe90f6b7fab1.pdf
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fd177652b26c.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/5450099.pdf
    • http://indital.space/49694564165g851l.pdf
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/vijitip.pdf
    • https://cdn-cms.f-static.net/uploads/4470387/normal_602a84059ed18.pdf
    • http://wulixiv.sportsontheweb.net/gorubutukaju.pdf
    • http://blacklaser.ru/1029037488jxajm.pdf
    • https://subogepaweb.weebly.com/uploads/1/3/2/3/132302814/nudasowop.pdf
    • https://cdn-cms.f-static.net/uploads/4480585/normal_602c03dec825b.pdf
    • http://sethel.xyz/why_is_my_pc_making_a_whirring_noiseoc5px.pdf
    • http://tryadasert.online/optiplex_7010_motherboard_typenuxa4.pdf
    • http://indital.fun/lg_smart_diagnosis_app_microwavelsa3g.pdf
    • http://tamakedesununod.mywebcommunity.org/sediaan_apusan_darah.pdf
    • https://cdn-cms.f-static.net/uploads/4384152/normal_6051af7cb19ae.pdf
    • http://zoneeuro.pro/ryobi_10_portable_table_saw_accessories3f7xp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://widusop.atwebpages.com/23823653061.pdf
    • http://sofibimibojas.myartsonline.com/what_jobs_bachelors_degree_in_psychology.pdf
    • http://nabafutig.myartsonline.com/65117490325.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_off0000fd2e.bin
e10428ea4bb5cab6da40eb9a072b0d57b9624743a67b8618153d921e1891be8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 5136 bytes
font_01_sfnt_off00010ea7.bin
883992b962dae3824a246058087f451bfcab4d8ead0d3aae09010240049d023c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 12668 bytes