Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f5346509e7697f…

MALICIOUS

PDF

70.4 KB Created: 2021-01-13 03:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cf1cac2f458f5827eb7667df7a3e3e5c SHA-1: 9578060d020a10ba211f075a8d284b4c7646c949 SHA-256: 85f5346509e7697f0b8014dd0892bfbcf713b53950b719722ef8924aba21f25d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly and other free hosting services, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=ibc+construction+types+table PDF link annotation
    • https://lilijivopot.weebly.com/uploads/1/3/4/5/134599675/femazoxorizinewetit.pdfIn PDF document text
    • https://tifixexeruwa.weebly.com/uploads/1/3/2/6/132682204/xixesovasiwinefeno.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/ihihjav/maboxawolixufesawanuxa.pdfIn PDF document text
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/512230.pdfIn PDF document text
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/zuxoxulut.pdfIn PDF document text
    • https://site-1229287.mozfiles.com/files/1229287/fokenosavuxuwiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tavolimogid/ighuvEk/comfortable_fold_up_desk_chair.pdfIn PDF document text
    • https://site-1168170.mozfiles.com/files/1168170/27931161421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5fb004ce853e8.pdfIn PDF document text
    • https://mesofuxemivoge.weebly.com/uploads/1/3/1/3/131398024/d1d605ed938ec.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/tunatofurenafup-pugode-zuxubufof-votaba.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/640184.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/sikuva/xefevagugexurixa.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/zombie_hunters_online_game.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/zoretufi.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/bupezuvumegamenurisu.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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 5108 bytes
SHA-256: 41454989b25f8190edb6799d930aeccffb3fcf9639d522207a4afaaef2b67ead
font_01_sfnt_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 10260 bytes
SHA-256: 543e4d1fe4c8ae903646f5f1201577fea6da1e4a88f8e92afd50585d7e4f26a1

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