Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5957dea85c1bc88…

MALICIOUS

PDF

89.0 KB Created: 2021-02-12 03:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f1691df135ba305fe10732605a690e82 SHA-1: 4ff249b08dd9f3464a14b156bd9421c73dcd89f2 SHA-256: d5957dea85c1bc88cb5127890fa923cff89c2396cb23cf22171ab5923f5360e1
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://druttle.ru/wix?keyword=marissa+meyer+scarlet+pdf+let%25C3%25B6lt%25C3%25A9s', is suspicious and likely part of the malicious workflow. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=marissa+meyer+scarlet+pdf+let%25C3%25B6lt%25C3%25A9s PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486346/normal_600ec176a426e.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/fnBbjdf/trial_xtreme_4_hack_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/hgjav3R/25188307329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_6002c2b0e0689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fe41020137f4.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/yWMXgg3/grand_formula_racing_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426688/normal_5fca20a475c90.pdfIn PDF document text
    • https://bososotozakep.weebly.com/uploads/1/3/1/4/131437593/ea76b054ba7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_5fce0f9e58d98.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/rilexazejuzovep/legakefizafere.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/cambridge_starters_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/idle_miner_guide_idle_cash.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/42368282648.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/book_binding_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/nojulebemizeke.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_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 5688 bytes
SHA-256: c3661798acef7ba4205fe93e0b12f6691c1e4515f9fad3409d1a14ad6890f4ef
font_01_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 11232 bytes
SHA-256: 00e8b60a25dff53839c11192f7b6101b4e9c6123b953ab29a881bbd6336b90d1

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