Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac19bf48ffa8d092…

MALICIOUS

PDF

83.4 KB Created: 2021-06-05 10:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c81d0e2c021750cc48ce2fec83ffd0d9 SHA-1: 3085cc09a5694e5b5fea838882d31dee5083ad90 SHA-256: ac19bf48ffa8d0929d5e349b1d05b8911e5f8f33e95360c9edbc3157c1291b5f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to a textbook download lure, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests the primary attack pattern is directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/pbw?utm_term=ap+biology+campbell+8th+edition+pdf+download PDF link annotation
    • https://gibinebixupiv.weebly.com/uploads/1/3/1/3/131379057/xudoba.pdfIn PDF document text
    • https://mixifotosipepe.weebly.com/uploads/1/3/4/8/134875306/de1e8e0fb77c47.pdfIn PDF document text
    • https://gupifamerimim.weebly.com/uploads/1/3/4/1/134132082/3874485.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/8425364.pdfIn PDF document text
    • https://tofixotiz.weebly.com/uploads/1/3/4/6/134621190/751aa5.pdfIn PDF document text
    • https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/6883158.pdfIn PDF document text
    • https://lakukuvirukum.weebly.com/uploads/1/3/0/8/130874631/nibapedimameg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/349d507f-bcb6-4f54-9240-1eeaa8f8b127/zewaneziga.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/how_to_attach_swiffer_wet_jet_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db805c54-2110-42bd-afcd-48d6e2a87dbe/fevojazomuvos.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/xugil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2271cd5-abf2-4cb7-a96e-014ce82baefe/2gig_go_control_panel_battery.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144419379/dapaxave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3f28a5-9ee5-4088-afb1-c58623798c53/dialectical_behavior_therapy_skills_training_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c79854fa-bb25-48f2-81d6-7c1abbf3f02c/lapufivedem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78b4d63-cfac-43bf-9587-abf79f8f465c/nobozowiwenadenibewagefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4a1f73-787b-434a-82c6-93c88aabdb27/11649275241.pdfIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144653502/molugedowavitedivupaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4905f8ea-ab22-4b06-9968-8da09128b12a/is_peripheral_cyanosis_dangerous.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a018f37-cd85-4f24-a5d8-52e442c131ad/biblia_hebraica_stuttgartensia_de_estudio_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c72bf88-9821-4894-9de2-7c1c00330aee/13725434123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4633d3d0-4ecb-45bd-98d4-fc15179a31f7/what_do_you_do_in_creative_writing.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/f/26184525689.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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5812 bytes
SHA-256: fc74792ed9fccbf5563dd15531f39789807e610cbf40e7fd053171f752d6c1d6
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 17004 bytes
SHA-256: 8153eb26fe5d42694d13e5e1faaf9147c8ecb85977c356ff0656eb5ef0221fa5

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