Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3976e38cadb0387…

MALICIOUS

PDF

71.3 KB Created: 2021-01-02 09:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 598d3d088b74f016ebbb5adeccb5ebbe SHA-1: e94b5ab70100eaf5ebf94a93fdb0f1141c7ebbda SHA-256: e3976e38cadb03878b0f17ddc83bfc9d6c35e1ce28490c0730307ac581362444
214 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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/123?utm_term=rosenthal+crystal+stemware In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5fa064c8a74ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421473/normal_5ff01274c1c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5fd7d9974e0c1.pdfIn PDF document text
    • https://kotafogora.weebly.com/uploads/1/3/4/3/134322717/1df88aa4aae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5fc6cb6092c89.pdfIn PDF document text
    • https://belatefa.weebly.com/uploads/1/3/0/7/130775380/fuxokekofojupi.pdfIn PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/9558750.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/eiaiamg/thumbtack_for_professionals_app.pdfIn PDF document text
    • https://cdn.sqhk.co/bosejadukifo/GZiHLhi/rugby_league_2021_world_cup_draw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fd71558c342a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_5f980c70e0a4a.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://s3.amazonaws.com/xapota/tom_goes_to_the_mayor_new_season.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/muzig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 4980 bytes
SHA-256: e597fa41c6f822c3ac6864c9e28650894de1c6dd9ea6fbc09e0d442d03607d7c
font_01_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 11152 bytes
SHA-256: a130b15520d6496e6c17cb3a9815f2d748176d1367832c8ed74eaff7f60d6d83
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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