Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfc8d3c66cb5f27…

MALICIOUS

PDF

74.5 KB Created: 2021-06-12 13:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 629eb0bfb1bc6b32fc4c594ed41924b5 SHA-1: effb3b95ef0e761ad25808464ea8d1a423360fe6 SHA-256: ecfc8d3c66cb5f275daace5b201a7d01e574444dfe2fe305c52c50c5fb04423d
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 0.9997

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://laborke.ru/pbw?utm_term=dm+guide+5e+pdf+free PDF link annotation
    • https://gigerexug.weebly.com/uploads/1/3/5/3/135341911/8bf93306e3.pdfIn PDF document text
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/3538395.pdfIn PDF document text
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/jabolibapixa_wisuv.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/8996ce3170d51b4.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/xubag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408460/normal_5ff8c8644196c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365549/normal_6003e98d12477.pdfIn PDF document text
    • https://lawawigulodupaw.weebly.com/uploads/1/3/7/5/137502749/3828910.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/5701454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393190/normal_5ff30b929d63f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_602ebd7945cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_6068cd2274f06.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/kidudewifiwat-vefipeliwipup-gelanetegu-kezugikos.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/sifutuzubex-xotepebiso-masafibememekut-tobegoleda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_602eecea00b4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juzifezazuk.pbworks.com/f/95367579829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b959fed-b001-443c-952f-e31aa80c2bbb/lonem.pdfIn PDF document text
    • http://garigor.pbworks.com/f/mugasanipapogax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9ad9d5-0385-4baf-b1d7-d928a673910d/how_to_play_fast_blues_licks_on_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d937903-1d98-4a65-87ed-dd363bc61ea0/9101040455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4a7bf3-9df0-4b68-8365-2ab011e70c77/vesegamazadaj.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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 5064 bytes
SHA-256: b3510c983fca1e0fba030ac58eba917c2a056f7e9574b31f9be6946737c3e76d
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10672 bytes
SHA-256: c4257ff95dfd0bedbce43bc4d633f2d47697f0370eab45b7f8bfb464adfd501e

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