Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a87d8adc8c779b…

MALICIOUS

PDF

84.4 KB Created: 2021-05-03 09:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fa3a409905804683c6be2bba8592ea2e SHA-1: 20450a57edc233bd8c95caeb6c01939b4f0b0074 SHA-256: 64a87d8adc8c779b5a5117fd9d3e21099c05e0eca289bfeb0ca07710c3377064
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, suggesting it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution vector, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/strik?utm_term=scag+turf+tiger+shop+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459784/normal_600be900d129c.pdfIn PDF document text
    • http://useplafond.xyz/how_do_i_put_my_earbuds_in_pairing_mode41nol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_6043572e94ebe.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/gupumijaraba.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/how_to_find_the_discontinuity_of_a_piecewise_functionzq5jh.pdfIn PDF document text
    • https://cdn.sqhk.co/wodegamido/gihTia5/bluetooth_app_free_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/mggie2W/diwemuvoranikebojuwos.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/05a7b59e.pdfIn PDF document text
    • http://iuts.space/45049528771c9j5d.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/hdQLZtx/easy_bundt_cake_recipes_with_cake_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/nabokufawogo/4hjhfhg/mindtap_answers_key.pdfIn PDF document text
    • https://napuraviseso.weebly.com/uploads/1/3/4/3/134322211/9039164.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/jfTodjh/themes_apps_2018.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/womejubojisunezuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_6039b5b187978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_60299e8fdf1e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_6060ab73f34f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fc98ec8964fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_602db20b04636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464522/normal_6057c072d0c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_6034f00140701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_601b70ac843fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 5532 bytes
SHA-256: 9a653034d259ddeb7449729804f043271f147b82e86021e006979f2558a75132
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 10796 bytes
SHA-256: 8c51f9a18550a8897b7ea3a7137f739c4386204d5b9bdf4bb056316420d32c3f
font_02_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e