Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c814c3c46665b6…

MALICIOUS

PDF

65.6 KB Created: 2020-11-09 17:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3e2e17b41ee392cf4fa64de3d60f2191 SHA-1: dfce4ccc7a258fa25f3255eae8e1dd5d9f894dfb SHA-256: 70c814c3c46665b6af6b22f52c23d6e0627c0804f9c7cf753c664c9d31947b04
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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.
  • 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://traffset.ru/aws?keyword=bisd.us+stell+middle+school PDF link annotation
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/nibupitola-valonuzuz-jarulapozot.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/pifewarizowidutel.pdfIn PDF document text
    • https://zasipirowi.weebly.com/uploads/1/3/4/2/134266189/tosoxegatega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f939096c5a7c.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/f15cfa599048c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fa8dbe3ed89f.pdfIn PDF document text
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/6193421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5f93d8512cffb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potofaw/88046791467.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/canzoniere_scout_con_accordi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f80f318-fda9-4655-8ef3-65d5a298d3c8/who_is_minho_from_the_maze_runner.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_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 4952 bytes
SHA-256: 179ca2b37271072b75d9caea772175b3490506b3cd08c991dac584394c79b1ed
font_01_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 9560 bytes
SHA-256: a0003badb83cb592f30075a50510bfd7ab6795875421eda1d43e1d0bb12a26ed