Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c5c9e597c3f8a5…

MALICIOUS

PDF

98.9 KB Created: 2021-03-28 16:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2e60349b12da9e7f2f780249018803c4 SHA-1: 912758e5d45fd98b4759576e816ee999ec0c836b SHA-256: 10c5c9e597c3f8a57d5081172545e9522bfa4bc9e00e6da69d850484f00536c8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads. The document body's obfuscated nature and the presence of external links are consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/123?utm_term=party+city+holdco+inc+annual+report PDF link annotation
    • http://evilcheats.fun/90976852956c9w10.pdfIn PDF document text
    • http://udilische.club/jibipegikafarumamapumi83c.pdfIn PDF document text
    • http://xbet1.fun/sharepoint_2013_designer_clear_cache5d03o.pdfIn PDF document text
    • http://alifan.store/vtech_ds6671-3_dect_6.0_expandable_cordless_phone_with_bluetoothob5to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_600c810b9d166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_60159ee622bef.pdfIn PDF document text
    • http://gugelomem.22web.org/what_does_a_red_and_yellow_light_mean_on_my_nespresso_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_600ff8cc663c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6040ffc29d695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490547/normal_603351f050dfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_60244c72664b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5ff63a18399d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_605385ca1629f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/debiwelof/ability_one_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/fundamentals_of_pathology_by_husain_a_sattar_pathoma_2017_paperback__videos.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/wordly_wise_book_8_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/17770808457.pdfIn PDF document text
    • http://kibototudezusob.epizy.com/12864569394.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_off000144c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C0 5088 bytes
SHA-256: c28e41604fd739299780c043fdcc9160fd2c5a28879a3a1a21d785aa167bdecb
font_01_sfnt_off0001560c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1560C 11496 bytes
SHA-256: fe2542d00999f66bbd1da2aeeef3ec2adc2aece4ca1cab3b0cd43f2411376b2a

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