Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d85071ea41e69f3…

MALICIOUS

PDF

88.5 KB Created: 2021-05-18 09:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a96eb076097c78492886f26874b300dd SHA-1: 4042faefcf8fb55be552de16e54c0c2c563405be SHA-256: 7d85071ea41e69f35085202971b5c3fd1c73d39130a0b2b20815ac4ca91e0260
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 numerous external links, suggesting a link farm or redirection attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a pattern of attempting to lead users to external, potentially malicious, resources.

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://cdn-cms.f-static.net/uploads/4445869/normal_605eebfe130b6.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_5fd90318821f5.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/gukodobulozuril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_6024a0ee53476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_600b3c8ad1155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_60616a6652ca6.pdfIn PDF document text
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/88f16b52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5fdd43d51e2bc.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=principles%20of%20economics%20mankiw%208th%20edition%20pptPDF link annotation
    • https://uploads.strikinglycdn.com/files/c93f7b76-38c7-4631-a54b-fc6a4942e67d/bimejefumajagu.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/massey_ferguson_tractor_135_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/general_motors_company_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/automate_boring_stuff_with_python_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/anet_a8_setup_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed3e3ba-8fdb-4ef6-8493-b2a4c1ae3a82/zojibitujonadaxuxanurasiw.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/kekul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542c76cf-0bb4-43cb-bf9b-fc72c9d1558f/how_to_cook_brown_rice_in_pressure_cooker_indian_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e765c2c8-571d-4cf4-a89c-a02aa688e9fe/bosch_axxis_washer_maintenance.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_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 5532 bytes
SHA-256: 278f5f6edd68f1edac489304f0bf508fac443a017327abe1f1dcae15a2d3bf43
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 18676 bytes
SHA-256: 73b87540f54d496a93b5998f7d3a04cc039b2545551bfc6615aacbe09e114601
font_02_sfnt_off000144ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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