Malicious PDF — malware analysis report

Static analysis result for SHA-256 1837176b6baf277d…

MALICIOUS

PDF

72.6 KB Created: 2020-12-04 23:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8a6176cdc660548b3ba8d27045ce84e4 SHA-1: af8a599172ff1c9725a203aa951326e5bcef3950 SHA-256: 1837176b6baf277d48fb455c99c4a2db9d6f2e102ec89712950c2140f41553ba
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. ML classification and ClamAV also flagged the file as malicious. The embedded URL is likely used to lure users to a phishing site or download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/aws?utm_term=google+sheets+count+if+sum In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5f9bd2a09c44a.pdfIn PDF document text
    • https://bugitepekasi.weebly.com/uploads/1/3/4/6/134669175/wivavuwubom.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/kozosoluzaxugerusewi.pdfIn PDF document text
    • https://xekexudaxojow.weebly.com/uploads/1/3/4/3/134365032/1259650.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af92489f-4100-4476-bc25-83a58026d977/22543716852.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2f486d235e080ea85b03/1606233928758/common_lexical_phases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2624b754-f193-42d0-89a4-54edd7b98e12/77271790021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0aef714-b69e-405d-823a-749dbd309a48/mejizuledizeranelotowada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5229c2bbd74065821fe32/t/5fc8e247a9f67830ca061953/1607000649784/57520856650.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bebbcd1e280355d37542/t/5fc1379cf81c9a2a0cce5199/1606498205665/52895530341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbe7908-ff2b-4dc0-b432-f7ab486ca82b/gorujezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba4088d-d979-46ac-9da2-9d53722fe758/xikezodezidefove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f14bca-8d54-4034-952c-c3c65f972573/71709053802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5f5731-4451-4633-b2b8-48ef313b47cd/53469129876.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_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 5020 bytes
SHA-256: 61ea7ebe0228ca25be2dbb7a1e11b6076bd46155b005c5525b274c780f090d7d
font_01_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 11480 bytes
SHA-256: af3e0d53c92483c2358bb5b7f9f0623b520c485d5aef4b85e55321c2967de149

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