Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f37b3215622451…

MALICIOUS

PDF

76.4 KB Created: 2021-04-26 15:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f863e4fb7267abe5613da0f853196a6e SHA-1: 05c0693b33c0a10861cb5be543056f3c526144ca SHA-256: f0f37b3215622451d3a41d60285d5fbaf9a0a1d05d2eca959edadcc19263853b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=un+curso+de+milagros+leccion+277 PDF link annotation
    • http://moneymaya.site/45884877511rksst.pdfIn PDF document text
    • http://daimontimur.org/rhythm_engineering_chennai8hpn3.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/vobule.pdfIn PDF document text
    • http://tojipipawerar.22web.org/karevogasoxofe.pdfIn PDF document text
    • http://inmyshtangen.xyz/wowosiboxonunomajpb8ff.pdfIn PDF document text
    • http://casserlabs.xyz/37776798442t6pj6.pdfIn PDF document text
    • http://trudogoliya.online/life_and_books_and_everything_season_2b4u20.pdfIn PDF document text
    • http://uscreditmonitoring.info/35021372971q3egb.pdfIn PDF document text
    • https://pizopivawot.weebly.com/uploads/1/3/5/3/135347149/1cefdc7.pdfIn PDF document text
    • http://inmyshtangen.xyz/student_led_conference_reflection_sheetqos7p.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/gusezaguskpkv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwozarawipuzi.rf.gd/35010476395.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_8f33340f20e343c79948034bdb1f6519.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_d45fd694edfe4304b08c843f3947be97.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_b5b055c1eedb4be2842fcff29f1b0487.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_5927cb1893fc47829171ebd5eee31787.pdf?index=trueIn PDF document text
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_33e4b127d7aa433daa3050fbb502080c.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_f80864c75af04a6cae927940970380e5.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_9f1f1dc58089472e9280282dded78ab1.pdf?index=trueIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_6e981ee590674996a530abd00bbe553e.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_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 5464 bytes
SHA-256: d67435547ca98d7dda109142d381c35184ae4108b3270a28258991b54eb610f0
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 11896 bytes
SHA-256: b9ae7ae8b34fd9fba32ba6577d6d6d458378cfc381b0cfa956f9050dd6641aa4

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