Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fb85f3a6b11908…

MALICIOUS

PDF

70.1 KB Created: 2021-01-13 13:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 404ac9f2de4688be91f549ed4b793ffc SHA-1: b93b76770702c74063f0faa8a0ae3a2356b50257 SHA-256: f0fb85f3a6b11908e205650bdd4617d6055f929f6c0aad3372b3341c40b09be2
156 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. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/aws?utm_term=extra+long+full+size+bed+sheets PDF link annotation
    • https://gizibufunete.weebly.com/uploads/1/3/4/4/134492386/c0c4931a0f4.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/4k3ifid/cover_orange_2_level_3-_18.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/a3eb470b23.pdfIn PDF document text
    • https://cdn.sqhk.co/wepuvumug/YAjc5dD/73760267016.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/wadumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fc3faea9d9cc.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/pagen-mugudimu.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/hjcehjQ/drag_sport_bike_wallpaper_iphone.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/levivegulisadana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/bossier_parish_arrest_report.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/sugaramiverodagopixe.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/animal_kingdom_episode_guide_tv._com.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/arduino_uno_wifi_esp8266.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/xixupefu.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/leponanivomoxasiwol.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 5384 bytes
SHA-256: d0e4a4138d7b1b94c6e7433580f821c3b4d438f8e53ef606edc9d872aae1a5c1
font_01_sfnt_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 10424 bytes
SHA-256: 3d7828313bf84e2df44962b16664a3f4ad3c8a53a58646409892a589f84b5de2

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