Malicious PDF — malware analysis report

Static analysis result for SHA-256 161d8b175f628387…

MALICIOUS

PDF

65.3 KB Created: 2021-02-21 07:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 06d0a109018a988e1722398f9a7ddbd5 SHA-1: a9cd00167284757554649c95d489b8c0d1122eda SHA-256: 161d8b175f628387203091cf60a98e31a8b7348d4d76ffd3ee8662dd42bef98e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

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://jottigo.ru/strik?utm_term=hobart+model+1612p PDF link annotation
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/9d88656ed3d89ef.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/mubokilen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5ffdb0e21c38c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372382/normal_5fdf6f7ad9fe6.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/xirokumukot.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/4687384.pdfIn PDF document text
    • http://keribek.22web.org/baskerville_bt_bold_italic_font_free.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/regege.pdfIn PDF document text
    • https://betetaguzom.weebly.com/uploads/1/3/2/3/132303315/vizinilobega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_6031d3c94839f.pdfIn PDF document text
    • https://zeruposizagaki.weebly.com/uploads/1/3/4/8/134854722/366f8de15f824.pdfIn PDF document text
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/kasofejefamus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizepojuduw.rf.gd/35721238599.pdfIn PDF document text
    • http://litemulum.rf.gd/gowobonavefumixukojot.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/dj_dance_song_new.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/basakejekebamobetenere.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_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 5368 bytes
SHA-256: b825864fc763283a75f0d8e4dd3419bdb31e1a879e7989ac957691cc1d542c6b
font_01_sfnt_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 10708 bytes
SHA-256: ac8b3d9baf87642501e91bd1e620253ce770fa30b9169c1f23c46f1298655782

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