Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8713c8137aef188…

MALICIOUS

PDF

79.1 KB Created: 2021-04-07 22:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9395df1f3bac9679509860dfbc50c9f8 SHA-1: a0028d71c273aefffd57f685f02542de8a076e49 SHA-256: f8713c8137aef1889bd371001636b210355f0e94a6b862fee09313759c884727
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm designed to redirect users to external malicious content.

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://gimoguvi.ru/123?utm_term=agencies+of+special+education+pdf PDF link annotation
    • http://faponabon.mygamesonline.org/robert_plomin_behavioral_genetics.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/55691956689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_5fda64a78a9b6.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/mekiti.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/bibezidaz.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/pengertian_gymnospermae.pdfIn PDF document text
    • http://filmera.ru/the_outsiders_enrichment_activities306dv.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/adriano_zumbo_cookbook.pdfIn PDF document text
    • http://theharaka.online/436388786623wv0m.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/podufodutakof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_601d5e8846390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_6004c3fe82e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_6032237f99302.pdfIn PDF document text
    • http://dokaxirugik.medianewsonline.com/63251238500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_2098fc36d8604118aa684797b129155c.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_91795f64446b4584aec55ced204cd5e0.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_717abb51bfc24bb4ab32c00da8454490.pdf?index=trueIn PDF document text
    • http://xevijojikutep.onlinewebshop.net/bacterial_genetics_microbiology.pdfIn PDF document text
    • http://tisavan.onlinewebshop.net/84780650534.pdfIn PDF document text
    • http://jugugesazo.myartsonline.com/real_estate_brochure_pune.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_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 5216 bytes
SHA-256: ccc710394dbd9af3d30d962e8c8fce69d631ad0f2108cc6b1c980b87c4b34e92
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10468 bytes
SHA-256: 701f7cfdd66b06a4723bf6ff09f174c2740864518a71fd110d0ee737cb7a7768

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