Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef0773dfeaa9db8…

MALICIOUS

PDF

74.1 KB Created: 2020-12-20 22:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 90de049560597caf5cb08eb25fb05b21 SHA-1: 0880f5cf6458b42242bf169ef1340134d37eda48 SHA-256: 4ef0773dfeaa9db8df58be471f965bb2bd7221ace9b28e98a6264badb18f77d1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with several pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=zoho+mail+imap+settings+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f88c7b44390b.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/gegukesopalusiju.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/9493165.pdfIn PDF document text
    • https://xibedawik.weebly.com/uploads/1/3/4/5/134584063/dararikulek_zufomuj_nilasigox_satedikag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5fb25bf1ec661.pdfIn PDF document text
    • https://lakenugud.weebly.com/uploads/1/3/4/9/134901786/nejajulan.pdfIn PDF document text
    • https://zuwulixomelonib.weebly.com/uploads/1/3/4/3/134385653/jekafazoveke-misugo-navonabaguvapav-xixavepetuv.pdfIn PDF document text
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/wopejoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f876211893e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jijumupade/jitajuzujikanewemubi.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/lafef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49d2fd9-b402-4187-9420-06129591ce36/70150435313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa53fd9f-ae20-40aa-95b1-c95b71704bd9/gaxakawefumonuzifufekam.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 4560 bytes
SHA-256: 9c26e4c2c048d8aaa4fe78a095b042061ba5e2599cc9af65dbb1bed4a36c6368
font_01_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 4880 bytes
SHA-256: f33d0c568869a9805e037c222734bfee335b2621043fb5f68fd9b37b22a58ed1
font_02_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 10464 bytes
SHA-256: e4eab825d46a92ed418dd5360cd5f78816d105dc8fe83eab57bfdf826d575e5c
font_03_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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