Malicious PDF — malware analysis report

Static analysis result for SHA-256 73489c17e7c2db8c…

MALICIOUS

PDF

80.6 KB Created: 2021-05-16 00:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0c3afdf3f8c6c42f5c3b76d60067604 SHA-1: 799d922cebc3bdc855f273ea9ecd2f56d0f07145 SHA-256: 73489c17e7c2db8ccb2374b6a06cb406a1569207f73a44c278df3841a17a7774
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous external links, including one to 'jottigo.ru', suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=girl+with+the+dragon+tattoo+film+2009
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/3165361.pdf
    • http://babbieshop.ru/pogatik5y0xy.pdf
    • https://vizumijolotetip.weebly.com/uploads/1/3/5/3/135394273/1188879.pdf
    • http://trynon.xyz/276234984365s8nr.pdf
    • http://fopekoriw.sportsontheweb.net/accidente_cerebrovascular_isquemico_tratamiento.pdf
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5ff030793dfbe.pdf
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5fd31208b2033.pdf
    • http://subakegewoje.sportsontheweb.net/sistem_reproduksi_manusia_kelas_9.pdf
    • https://cdn-cms.f-static.net/uploads/4422640/normal_605b9bbb596d6.pdf
    • http://normaa-id.com/convertir_pulgadas_a_centimetros_onlinepw4xa.pdf
    • https://cdn-cms.f-static.net/uploads/4471481/normal_606188436d79b.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_60184eb6f1347.pdf
    • http://kind-insta.site/divine_comedy_book_coverm8ia4.pdf
    • http://afracheat3.xyz/10033365564rd31p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_e930a6206dcc46ff890220b2572d10ce.pdf?index=true
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_349c41df39f7408f8fc9b842b64e9a91.pdf?index=true
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_b91df6a4558a4ccca3eea797b183547f.pdf?index=true
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_f39c0c5cfe394b54a6895a4e767d42ca.pdf?index=true
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_06055c9c115c4d1c9f33b486191d8f5a.pdf?index=true
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_428470e485944accadf674b4ed81801f.pdf?index=true
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_e5749febc24f41279b060ec1560de7f7.pdf?index=true
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_4e82eb1f3b5c48a79488b0e737d056ba.pdf?index=true
    • 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_off0000f8a9.bin
35484fea8a253f00da04334b943cdace7805442b729059308f084f19687f90ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 5696 bytes
font_01_sfnt_off00010bf1.bin
6ef33a3798d203b2f560d8be487adbd312d3dd50efa236ae68ad53133bcdb80c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 11660 bytes

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