Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17a94df259b0d82…

MALICIOUS

PDF

75.5 KB Created: 2021-06-10 21:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 199b1c0f330d471316571d640f349a43 SHA-1: 9320763566b31c38e8f5d5e1407e943ab089efa8 SHA-256: a17a94df259b0d822d8482111de7a76626288f72bd98c5839d78af54482d3fc0
186 Risk Score

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 functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely as a lure for phishing or malware distribution. The presence of external URIs and a large number of linked PDFs suggests an attempt to distribute or redirect users to malicious content.

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://pixomot.ru/pbw?utm_term=cuphead+full+game+download PDF link annotation
    • https://juzubuju.weebly.com/uploads/1/3/4/7/134703155/fojofokaxi.pdfIn PDF document text
    • https://rizibibaruf.weebly.com/uploads/1/3/5/3/135383358/bagige.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/9b680256b5a93.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/436e0bef1d.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/losodipawinasipaj.pdfIn PDF document text
    • https://woluxubofij.weebly.com/uploads/1/3/1/3/131383763/ziberefunofe.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/gilogadu.pdfIn PDF document text
    • https://sagolofuba.weebly.com/uploads/1/3/4/8/134873879/karuxazo.pdfIn PDF document text
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/toruzulalex.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/fb7a74a3-3e9e-455e-b0ec-d33cbc91c05e/comcast_x1_youtube_app_not_working.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144426831/best_mame_emulator_for_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4ee600-4c06-4c38-b778-1f397e7c0467/lulufopusuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdab6713-6ffb-4cfd-8148-f9a4c635de7d/30818878415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc90e883-c221-4747-9b84-d775859f5c70/xowewikatejem.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/w/file/fetch/144987366/kerala_padavali_malayalam_standard_10_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af3c3f0-44df-41e5-bc50-0b930ab4789f/gawusesunonarinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5deed69f-385e-498e-9e05-23843c42648e/jiguluwuwekomexefofojaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a990acb0-1a7a-4186-96c3-051c5f101bcf/honda_6500_generator_specs.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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5180 bytes
SHA-256: d4ad67635bb31e1c7608263b3b873857653a2c474282acc6bd0b8b9efcdd6117
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 10760 bytes
SHA-256: 830dd31e3b4cb6b90007cbcf2aad9a505f71d0f3e5ba3aa19569989b7a7f1117