Malicious PDF — malware analysis report

Static analysis result for SHA-256 505a91768dafec0e…

MALICIOUS

PDF

82.2 KB Created: 2021-03-16 06:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 237cc6cad9bfbf49d198a3c0b07fc48b SHA-1: d621b73690f64e4005cbd5fc9540643fe6a8f8ef SHA-256: 505a91768dafec0ec2f516fa1952ea3ffa056572febca1d9ff0afb9c38f4f5ce
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. ClamAV detected it as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded URL 'https://jottigo.ru/strik?utm_term=whirlpool+water+cooler+not+dispensing+hot+water' indicates a lure related to appliance repair, likely to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=whirlpool+water+cooler+not+dispensing+hot+water PDF link annotation
    • http://bewizasosu.sportsontheweb.net/barbie_doll_poem_meaning.pdfIn PDF document text
    • http://givotovujoded.22web.org/employees_provident_fund_withdrawal_form-_19.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/le_millionnaire_marc_fisher_gratuit.pdfIn PDF document text
    • http://xobilosusi.sportsontheweb.net/electrophilic_substitution_reaction_of_pyrrole.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/is_cyberpunk_out_yet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_5b503bc154d04d7d9d12ebea5e73d38b.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_5363e509a448444ea95b1536fd2bf271.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb1c813-7926-44a3-a311-2eab623becd8/girevuzuwopofamuke.pdfIn PDF document text
    • http://kimirukuku.epizy.com/basic_korean_vocabulary_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11079715-ca87-42dd-b239-743adc424d76/5290696775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643e5431-1619-4de0-b662-a94f8f3c07a9/paradigm_shift_bob_proctor_download.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_cbdb8ee34513462784c8cf8800b3dbff.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_88cac6a0bdc248b08bc47a6d71c31272.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0952d5cc-b310-42f2-9ef9-a5d332b61ac6/what_age_is_vampire_diaries_suitable_for.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_feb9cec287674a43b4a16e864340cc71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a2757e-9d6c-47c4-950c-a088111f76a4/how_do_i_get_my_learners_permit_in_mississippi.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/yamaha_rxa830_price.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_e7ad41bf6421468aa3523ff30f2aa32a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/carmina_burana_carl_orff.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_198ac101deef4ebcb7aaae8417150d87.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_a471452d706847e49b9bc56e4787dede.pdf?index=trueIn 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_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 5440 bytes
SHA-256: 541a30c5cb0616633588d3724852c8a38b40d322dbe83f8de562332c07998327
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 10812 bytes
SHA-256: d72f5c1ad1eb8b822b216d994fa1ed271f426ffe9e8e2d02ed9dbbac2dfeb7ae