Malicious PDF — malware analysis report

Static analysis result for SHA-256 b979fe9e1c562753…

MALICIOUS

PDF

73.4 KB Created: 2020-11-11 20:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 57d3454103e180b60d8e1629d3d29a01 SHA-1: 9378c6868d29051d4f63bb119d4c16baff0cc1d5 SHA-256: b979fe9e1c562753dbcb40000a7facc4f63068d37ca95412188452e104a891a5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=lafourche+parish+schools+salary+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f8fa0cb3ccf3.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/1163986.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/zategafozasiru/takitugisoxun.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/68935742310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90d2397-47e4-4201-b2aa-c7447542d619/jemavemogikoxaxekovobag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1d4b01-6458-4039-a3de-2ed836ffe56e/povemikumuwadetixiwumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fb8060-5ec8-42ed-a318-410ec1ca662f/66302782982.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/alto_saxophone_finger_chart_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/r_and_r_sporting_goods_milwaukee.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/polycab_ceiling_fan_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5539bee-0b8f-44b4-acf3-c575d8b8e1af/20511860323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab87d26-8700-41f7-ad9e-e3cf00b4e3db/dont_feed_the_bear.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/gst_annual_return_notes.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_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 4980 bytes
SHA-256: c779b6afc4386bb5cc3af8dc3d809f0f57fd411c6a28b6ce7ff0dba12418fe57
font_01_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 11412 bytes
SHA-256: 60d2ac1479b098ead5e0756e9049a2e84ecadde1c01710a10a7b4ccbd8517f0c
font_02_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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