Malicious PDF — malware analysis report

Static analysis result for SHA-256 924636f2367dc05e…

MALICIOUS

PDF

74.5 KB Created: 2021-02-13 02:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a26ef1ede8d0058f2e9eb49d6c1fb964 SHA-1: 69b43bc0e7ed8a6de10723b9981b2005db908241 SHA-256: 924636f2367dc05e61b57d993ee2ea903d369e041817dc8e9b5adf52689c87cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm containing numerous external PDF links. The ML classifier also assigned a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'cash flow' and 'wkhtmltopdf', suggesting a potential lure for financial information or a document generated for malicious purposes. The presence of many external URLs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=difference+between+indirect+and+direct+cash+flow PDF link annotation
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/kefipuxerolu.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ij1D0jc/89696921724.pdfIn PDF document text
    • https://cdn.sqhk.co/tezasevimab/jhhagdp/video_poker_strategy_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/Fe4rpih/41392745402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418984/normal_5ff75699cbebc.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/bgctWhg/47273503268.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/pjaoNhi/16162705924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446784/normal_60019cb166231.pdfIn PDF document text
    • https://bunoworerut.weebly.com/uploads/1/3/1/4/131438217/woxanagiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/T3Dvjd8/88786959599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_6023bbbd25d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_600fb118efc7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5ff2c04f78333.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/ZTb6Owb/clash_of_clans_sell_account_ebay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5ff002a0278e5.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/ceYjfge/11948779233.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/nowonovege/61446972139.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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5340 bytes
SHA-256: dc42894ca7f022e776b10f5524dcfa1d8aa84bf566393daa57737c2cc74e7eea
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10444 bytes
SHA-256: ba2cba4f02eaf6931cc50f79c414a34398433cf3cf9d2381c51689d4a912396c

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