Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c23204f414c4ca…

MALICIOUS

PDF

66.2 KB Created: 2020-12-21 02:23:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 75fbd3e9eeb655ed24929afb515ae225 SHA-1: 2c14a7048658441d7178e79de946bf4f2f49bff6 SHA-256: 81c23204f414c4ca6d7ed286636ee151d6a88df65fa1656d0889211c37545d82
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The primary URL, 'https://traffset.ru/aws?utm_term=icsid+reports+cambridge', suggests a potential SEO manipulation or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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?utm_term=icsid+reports+cambridge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453888/normal_5fb99ad5b1219.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/5a3b90e8d0ab80.pdfIn PDF document text
    • https://tuwunofibe.weebly.com/uploads/1/3/4/6/134657164/baluxivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fc4d60245c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fa007610bd22.pdfIn PDF document text
    • https://gitaxawisar.weebly.com/uploads/1/3/2/8/132814742/zixej_nedepugidewufug_vigurolilos_vakifimopusegap.pdfIn PDF document text
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/bikatajilemozela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459165/normal_5fc4d549a72f5.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/5932757.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/dutuzanob/backflip_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/driver_stampante_brother_mfc_l2700dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0cdfcb-a6b1-4d3c-be97-637828181d20/fractured_but_whole_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/44831824032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0a3d41-4ebe-4420-a64c-54de5ee291ac/408791519.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_off0000c295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 5436 bytes
SHA-256: 39b838281426c90530f8eb06686969e96ca6c1c839ad86806c4199896845ceed
font_01_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 11028 bytes
SHA-256: 20c9b65023cb04ce665aab178cb306ff646cf54c56a477d7c608f6e67fb74130