Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99e72c01376f8dd…

MALICIOUS

PDF

72.0 KB Created: 2020-11-23 15:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 20b59ebd15f76e27954306028f8b45c0 SHA-1: dfe11b799c2f96cddd9107b7a5cd3721bf513131 SHA-256: a99e72c01376f8ddb22da6ac5c19b901f16ec65c7589bce490da0d36c818c4a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to 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 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.
  • 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://trafftec.ru/123?utm_term=line+and+angle+relationships+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fadeb1883acf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5fa7f93f7a0ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f8a645cf0f15.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/9737917.pdfIn PDF document text
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/tesakiz_ladilakinuwi_luxutadata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f9397066cdf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5f990eea9642e.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/bifepufojokebak-maxofuvidazixi-vusebetupeg-suvunitukakabog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_5fb4755969872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5fa816a36550b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_5fb523febd750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_5fadbfa0447bf.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/ganubifirigevi/89443141813.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/kashi_amarnath_bhojpuri_movie_hd_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/xawelaxudamuvexosovokugu.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/kutakivowiwomodegepo.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
    • 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_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 5320 bytes
SHA-256: 3815945dde0218e7635587d08c370c7406d56117ca788492810b4d7fc84ae4e3
font_01_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 10252 bytes
SHA-256: ab3d16da2e218349d9f835d0ef19a71434e6eb35602da494401985426aede18e
font_02_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 16076 bytes
SHA-256: c6e5a50beeb96386e46c13b851249bedf13903b0e4c64ff4170c933eeab0380e

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