Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76dd8b35f7888aa…

MALICIOUS

PDF

81.3 KB Created: 2020-12-21 19:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 60d825f239f6b2e00becf6cc69676a53 SHA-1: 91bb61261a1dca3cd448ae11bd7b006fd81edea9 SHA-256: b76dd8b35f7888aa21e5fe7f82470066b15fac5d14e8276b5fcce9138be5d6f7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URLs, including one pointing to 'traffking.ru', suggesting an attempt to redirect users to potentially malicious or phishing sites. The document body, though heavily obfuscated, contains text that could be interpreted as a lure for a "Bt hub manual".

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/aws?utm_term=bt+hub+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458621/normal_5fa8d72f75add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_5fc1db5641aa4.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/sarewuvukidoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fdcb73953be3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fc679b405401.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/6165248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf3f73ca23154c95a92f8/1606218743822/zuren.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e70d1452f90b7fe56088/t/5fca39304e3f3d2517465ff7/1607088432491/last_minute_hotels_mexico_city.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc581231452f90b7f043f90/t/5fd11498f4e1da4bad71fb30/1607537816203/eon_player_pro_apk_5._0._6_r31.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1858bf7cf8c75402f5531/t/5fcd4afa920f47545ba25972/1607289597762/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e94506d-78de-43cb-bad5-c2455282a883/dempsey_middle_school_football_schedule.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a864fa9ecc3978a0c3e8/t/5fcafd4364036b614384fa46/1607138628555/tofemaxegajafaniz.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_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 4840 bytes
SHA-256: ad23a1400ae04577f2a07250fed3696ec2e7ab0ed30106cbd19f6bcd58b7e9f3
font_01_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 15128 bytes
SHA-256: e7feb22a8cf5d2a6214306dfd558da13a2cd629c26990bcdb9038534e44b38ec

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