Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fbbae013f24010…

MALICIOUS

PDF

73.8 KB Created: 2021-06-08 14:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd1283911b67fbe4086b13684bce52fb SHA-1: 302354e0574368380b384847af88028bfcf2ce92 SHA-256: a1fbbae013f24010e8608944e6d057c63100a0ed0ea4cd336b95ba02186b143d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://allytemp.ru/pbw?utm_term=how+do+i+fill+color+in+procreate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445118/normal_60bb2f90581bf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4479222/normal_60b5eaf869f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_60502b6857301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_5fdb24f591e80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473322/normal_60038939dea51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_605b53e66fab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd1e2b3ac6fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_60364931efe01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_604198349c5db.pdfIn PDF document text
    • https://rofukidixupa.weebly.com/uploads/1/3/1/4/131414661/4380744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_600bf58368f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_603581d656f71.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/vinulufibav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_6018b14fc48c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepodaworo.pbworks.com/f/richard_m_snider_reign.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/w/file/fetch/144728322/vedefevowafixus.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/digonadigesajuvu.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/radanena.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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 5024 bytes
SHA-256: 67cf06109becda344011df6f7ffbeb84de291c3b599ae54f7a9e038c96acf117
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 10076 bytes
SHA-256: 0a7c025ca57558d32d50a50b1fb1c1531aee2eb56b0a331332a09ff794193e29

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