Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8305bc02c6f83f…

MALICIOUS

PDF

73.6 KB Created: 2021-06-08 15:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6a6d7a20195c5d74877e6ec9700e64b9 SHA-1: 3feba107cb3bff34cebd23ad2949e95aebc82cb0 SHA-256: 9a8305bc02c6f83f00aa7c03c5cc2529ea78ebc20b2fb6d15ed35013bbb5e9c7
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, containing numerous external URLs that point to other PDF documents. The primary URL, 'https://nomylo.ru/pbw?utm_term=streaming+film+habibie+ainun+2+lk21', suggests a lure related to streaming content, likely to entice users to click through to potentially malicious sites. The presence of many external links and the use of disposable hosting services are strong indicators of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=streaming+film+habibie+ainun+2+lk21 PDF link annotation
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/5879036.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/e52dc6201eb366f.pdfIn PDF document text
    • https://mifitulu.weebly.com/uploads/1/3/4/5/134521308/dogagola_nijolanabugi_retod_vaguxow.pdfIn PDF document text
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/de579e32066c2.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/eea8522ecca.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/b64496d7456e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5ff8f2292d07b.pdfIn PDF document text
    • https://ferijadupegol.weebly.com/uploads/1/3/4/7/134705138/10110c8629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_60369f7d8cbdc.pdfIn PDF document text
    • https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/toruxuzesimufiwa.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/a9555d1f-db9b-41c4-bc95-373a3978ae6b/litogutikabumito.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144683145/how_to_solve_division_property_of_equality.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/41298814868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800737b8-5337-4428-acf5-8f5482e53007/1363083072.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/f/what_is_a_depth_first_search.pdfIn PDF document text
    • http://bapaminuv.pbworks.com/f/84989344704.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/w/file/fetch/144677655/rokozomoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3b374a-4dae-4646-9d37-3c0d42a49f88/1102447421.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144543966/market_entry_strategy_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b29ee4-df43-4bfd-9814-f4cceff7eb0d/22861986105.pdfIn PDF document text
    • http://kopixikosibi.pbworks.com/f/myofascial_pain_and_dysfunction_the_trigger_point.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/w/file/fetch/144587514/57290248341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215277a8-6c11-4832-9204-776ee75019bb/el_arte_de_la_seduccion_robert_greene_leer_online.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_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 5492 bytes
SHA-256: 7b237742bce283d62c807adf3ef7a9315dee1a4b627cac492809a439819d96f5
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10620 bytes
SHA-256: f9ddf926dd5c89a671b6e4bbf2d5e113341b2a9190dfb6d1569e66e44764def7