Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41dfa17b789c00e…

MALICIOUS

PDF

83.9 KB Created: 2021-06-11 22:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bb0fb4c81c650a03ce4b0e0e46945dac SHA-1: 307a2623635cd58c6132139afe91f95127e14f59 SHA-256: c41dfa17b789c00e66b8ba9adeb39363068e518c48b89a8f4bff8d2902326476
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

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://inwebjor.ru/pbw?utm_term=the+lost+world+conan+doyle+pdf PDF link annotation
    • https://xobazebesefegox.weebly.com/uploads/1/3/5/3/135321136/1124741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_6046030ad8294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_60111cc120581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ff3b9b6af0e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5fcb5aed1b47c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe0ff0ae7668.pdfIn PDF document text
    • https://kanoritixuvu.weebly.com/uploads/1/3/4/8/134874131/xisogosimis.pdfIn PDF document text
    • https://labomozojaxige.weebly.com/uploads/1/3/0/7/130738499/1908596.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144712458/pinawegajanugaxiselef.pdfIn PDF document text
    • http://fepazonavu.pbworks.com/w/file/fetch/144590430/convertir_cm3_a_pulgadas_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4534a52e-d0bc-42b2-a760-9c32a2e9b03a/tigojusakegefedamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0978030-4d53-4fc1-a466-3ff109f37fed/msi_760gm-p23_fx_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7382bad-a5fa-4cfa-8f27-7a99af872fb5/how_to_win_capsim_round_2.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144595659/4400862563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee03c103-3c89-4c89-b5eb-7cddae5265d1/best_quotes_on_friendship_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61f54a4-266b-4cd6-8612-78da843035f9/89899226506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1b2139-1cea-4120-8180-fce7e0243642/how_to_reset_genie_model_1024.pdfIn PDF document text
    • http://marutipug.pbworks.com/f/thuppakki_full_movie_download_tamilgun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25747b91-d793-45ac-af5e-7e885f322732/piwakejizexamirolepawu.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_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 5384 bytes
SHA-256: 2f4c2e1d39526a8ff49804f05553be20f30afd2ff2a1f11dd0408167c6188e00
font_01_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 11024 bytes
SHA-256: 5a0a5f4e88dde791e17d6ff2a91d2ee79ff6e521c86736ca31ce605dc4708dde