Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc5d2fae2c67c35…

MALICIOUS

PDF

81.4 KB Created: 2021-04-09 19:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e34e4890639e0ad1357de51ac61b149 SHA-1: cf4812d99d5060a90294a7ee9568bb645339843a SHA-256: 1dc5d2fae2c67c355b63bbb61ca98249f31a9ac1844c4187b0012d0d6452d62b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing or malware distribution campaign, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of a large number of external links, many hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links likely lead to further malicious content or exploits, aligning with T1566.001 (Spearphishing Attachment) and potentially T1203 (Exploitation for Client Execution) if the links host exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/strik?utm_term=fluval+fx6+for+sale+second+hand
    • https://zedifetizigofup.weebly.com/uploads/1/3/5/3/135393349/9b5edea0933e6e1.pdf
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/1163126.pdf
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/7297485.pdf
    • http://cesaregaspari.com/what_do_vegans_eat_for_mealshk0p5.pdf
    • https://dofebafedu.weebly.com/uploads/1/3/4/5/134588227/6752884.pdf
    • http://vipadminler.org/66172970907c4q53.pdf
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/8735678.pdf
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/3f1ab11ec7f4f6c.pdf
    • https://vijizonumek.weebly.com/uploads/1/3/6/0/136034009/33ae4c.pdf
    • http://pedron.fun/lovely_complex_episode_1_english_dubbed9ke2p.pdf
    • http://hotita.space/disgaea_4_promise_revisited_trophy_guidej6tss.pdf
    • http://shoplus.info/874603986ib9v5.pdf
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/resebejodomopig_sixazeto_dazonuzan.pdf
    • http://rubyshup.space/40900380649ebw98.pdf
    • http://itali-big.space/zediruvilui8ioz.pdf
    • https://fetazudumaveber.weebly.com/uploads/1/3/4/6/134615608/puforojizin.pdf
    • http://meetsol.xyz/belkin_n600db_firmware5tpll.pdf
    • https://vitojeji.weebly.com/uploads/1/3/1/4/131453493/5390266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eb69104f-afdf-4bec-90c9-12851050aac4/powabamelidikozetoweke.pdf
    • https://uploads.strikinglycdn.com/files/1ba87129-4076-49c2-99a8-c6495e006083/how_to_use_sentry_safe_override_key.pdf
    • https://uploads.strikinglycdn.com/files/72d0382b-e947-4b62-9d38-851d9082c5ff/republic_of_doyle_season_3_episode_5_cast.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a1.bin
6829a15dbc3d35df25e06885e9c32a8d166ca3f43a90f33a56f95464d5b46536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 5344 bytes
font_01_sfnt_off000112d4.bin
27c417adfaa5836a77ebd85a6ad59e8c4a697984962fbeb4f2ee949d6bd81d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 11044 bytes

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