Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f29be6a4208a2bd…

MALICIOUS

PDF

76.2 KB Created: 2021-01-08 08:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 41f86be14b9e675e82d0a2d335d0ea95 SHA-1: 24debd82cbe4e9ebb4fca714c6684758ea3b94f1 SHA-256: 1f29be6a4208a2bd9f5c1c347ea9def0776a0f023cd198dc5f032d4f722aed78
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and appears to contain metadata from wkhtmltopdf, but no direct instructions or lures are readable.

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://trafffe.ru/aws?utm_term=archipelago+definition+pdf PDF link annotation
    • https://pozanabuloga.weebly.com/uploads/1/3/4/3/134366917/677ab96575da47e.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/83a62439f7.pdfIn PDF document text
    • https://tovakuroxi.weebly.com/uploads/1/3/1/1/131164121/4244916.pdfIn PDF document text
    • https://mojebope.weebly.com/uploads/1/3/4/6/134609081/9579199.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/terozi-vejitidufe-woveb-malirigamuwedil.pdfIn PDF document text
    • https://xamaboku.weebly.com/uploads/1/3/4/6/134606559/rubekamopoput-tapamigo-zisezuf.pdfIn PDF document text
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/4502027.pdfIn PDF document text
    • https://jepuderakemuso.weebly.com/uploads/1/3/4/6/134666912/nuxodobexabejizave.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/1552544.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/mutirexa/11643837243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8468c3b-09f3-4d92-867c-f97f6f43f35f/mxl_4000_shockmount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04cf4840-dac2-4570-ab21-050698e3e054/30661371743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f2038f-d28d-4180-b74b-f7811cd6566f/petaxavemo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 5016 bytes
SHA-256: f8ed34229c963aafc388d3d60a626cfee23d37b5a5bff834034b174dfc7581cd
font_01_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 12840 bytes
SHA-256: 6c6872ce1a3b1e5abad804565c6bf3268c6bc06b11875abe246bce6eb34ca88f
font_02_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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