Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79d77256855d63c…

MALICIOUS

PDF

81.6 KB Created: 2021-03-31 01:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d2c2e6b3f1a9cf059163f5d65804d05 SHA-1: 173078c966422ea3075cf15f4e73426906413fb3 SHA-256: b79d77256855d63c2996ad6e4ed8cb6f2858c9d4e6e9a7645f46ea8e13fc28aa
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, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=learning+letter+sounds+pdf
    • https://cdn.sqhk.co/tomubozes/jJhihgG/battlehand_heroes_guide.pdf
    • http://ladekepevij.mygamesonline.org/4405263337.pdf
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/c3bdd0f703c.pdf
    • https://cdn.sqhk.co/miraroki/igfibii/59002887677.pdf
    • https://cdn.sqhk.co/padasagam/iFh7dib/xadisojagil.pdf
    • https://cdn.sqhk.co/zupisopad/hiyijB6/rijajupefojomimowi.pdf
    • https://juvifopabolosat.weebly.com/uploads/1/3/5/3/135313118/7fab649fbf5d.pdf
    • https://cdn.sqhk.co/fekurisakez/chaAgiI/kerinizunositudipuxud.pdf
    • https://tonikajolokoge.weebly.com/uploads/1/3/0/8/130874266/milujiselavovu-pagilidisik.pdf
    • http://lewuvumo.sportsontheweb.net/advanced_business_english_vocabulary_list.pdf
    • https://cdn.sqhk.co/kerutadit/IhejeAB/6050711201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_4af96e9573ea49aa8684cdfa8bea0793.pdf?index=true
    • https://s3.amazonaws.com/kifutizijebuj/mount_and_blade_companions_guide.pdf
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_ffb79c073c024d1db8b22baeab12b70e.pdf?index=true
    • https://s3.amazonaws.com/gowupuzokowuxes/85043290315.pdf
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_7812ac8788f04a04812d44ea54465a90.pdf?index=true
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_453f213423bd42299adafc2c1452589d.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_b0449b409d7542cba138cff4d1b230b2.pdf?index=true
    • https://s3.amazonaws.com/nefagolom/tinagid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001032b.bin
08b4404fc5d00e5f6c95a419e0e6b6a8f498c879a2bc55bed0f320293925d85b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 5152 bytes
font_01_sfnt_off000114c5.bin
877be3a777e799bc190459b8c1787f9832124320fc003d17d27e57691318d9ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 10772 bytes

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