Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff4086ab0af6de…

MALICIOUS

PDF

78.2 KB Created: 2020-12-21 08:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dbe185d9fd8d1b4c7ac54530b368d723 SHA-1: 398471ec379a20f9bdd3e147d197e71adbfe6c63 SHA-256: 91ff4086ab0af6de13b0da5223e5f6e1797487b4bc08250a69cf71e32ba0005d
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical finding for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The embedded URL points to a suspicious domain, likely intended to lure the user into clicking and potentially downloading further malicious content or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/strik?utm_term=lord+of+the+flies+heroes+wiki In PDF document text
    • https://tosulabemolajeg.weebly.com/uploads/1/3/1/8/131871730/1908284cd38c8.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_5fd3a5a2bb42b.pdfIn PDF document text
    • https://gililizu.weebly.com/uploads/1/3/4/7/134770310/9693966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5fb86550ec591.pdfIn PDF document text
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/4305550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5fa4f8f0d7f27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0f88bd26ff1194f740ef3/t/5fc2899c4f9837572031f97d/1606584734800/jisutalemarazadavezeju.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c273a13a450babf34cb7/t/5fc13f5018e72e5fdb04eb64/1606500186531/hasport_motor_mounts_fk8.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d70d1c8c7413143e99c9/t/5fcab0eaf7b7a17f4cfb2337/1607119082446/gijapekutajufef.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 4564 bytes
SHA-256: a55ea8e8e493f835cd9df0848a822ef5b977ea590724776e2f012703c244f0dd
font_01_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10556 bytes
SHA-256: 65fbe29395f9a484ee37f795ed8f32412b6b943527897a2320945d869fcffd8e
font_02_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174
font_03_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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