Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dc15fae175fc06…

MALICIOUS

PDF

69.3 KB Created: 2021-03-17 09:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 424352643396ff9461cb304d94dcf915 SHA-1: 3703bc31439f6212039b8a45a0b0a012eefed76d SHA-256: a2dc15fae175fc066626fe005b6df78a5f3af16488f199d5009ec7b1cb57af15
186 Risk Score

Malware Insights

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

The 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, with many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and the overall structure point towards a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=lsat+preptest+84+pdf PDF link annotation
    • http://viwavidif.getenjoyment.net/87348511937.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/79806480970.pdfIn PDF document text
    • https://kubogetitit.weebly.com/uploads/1/3/4/6/134617613/3054903.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/68219277644.pdfIn PDF document text
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/wubaneweditafakasa.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/jgigfXV/44278315371.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/ctet_paper_2_previous_year_question_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/hg8ihhj/defense_zone_3_ultra_hd_pc_cheat.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/xunomuvupobal-kerisofo-pugupirekes.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/ghhYjeT/78518558550.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/6gdbihW/area_of_2_dimensional_shapes_worksheet.pdfIn PDF document text
    • https://mixabukosi.weebly.com/uploads/1/3/4/4/134479433/4134675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/jufemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18dc76b-c22d-49ff-89bb-50f92667445f/notelonadoxanududafum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e715cde1-4d8c-4e37-b5bf-f884fc76a24a/best_choke_tubes_for_stoeger_m3500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187652ac-f6a2-4c6e-bbb2-6efec80912f5/2018_toyota_camry_hybrid_xle_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc255327-ff57-491e-b63c-a88bf606604a/how_to_avoid_yo_yo_dieting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6415964-3c8a-4db7-b879-d5e92df8820f/setemo.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/pimujabesuxujevat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcd91ab-134c-4ccc-bad1-12a1f693cfa0/66349955721.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/zosuzefati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7806f6f0-4998-4a39-ab2a-784f015a7219/lidamapezetojuferi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7d8909-e61b-40da-8336-dc19a13a65ab/pandaria_flying_wow.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_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 5228 bytes
SHA-256: a1ac4f7ffbd5753c12ea480b2aeb6ff90cb60a208ee90fd4d69d24577d790e9d
font_01_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 10356 bytes
SHA-256: c20643128d553910414787439782f190b59d14f28d30d185d4d4847e88f2811e