Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0609091b62672b5…

MALICIOUS

PDF

76.0 KB Created: 2020-11-14 20:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ea8cb5c053affa7a1db099080f9ca596 SHA-1: 525051072da711aa66673bf4005f638bc52d5cf5 SHA-256: f0609091b62672b553b2f10b0e4ca2fa68d45171032a1e7fd0672c3b2a8f8b0b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a common tactic for SEO link farms and phishing. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to phone searches, suggesting a lure. The ClamAV detection and ML classifier further support its malicious nature.

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://traffine.ru/aws?utm_term=top+android+one+phones+under+15000 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5fa10b318e02d.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/tejareziwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_5fa73983b6d91.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/xakusineba/swtor_companion_gifts_guide_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/kaantasan_ng_pang_uri_worksheet_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/midwest_rock_festivals_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3ebdfe-fca7-45f3-8eeb-3ca0b94e0cc1/sojajuxabobu.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/niduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34091cd3-982d-4257-8e3d-06339a906dca/barilizekodifezowodifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22be053b-6be3-4a8a-b8c8-5be9744a2fdd/cpam_13_contact.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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 5084 bytes
SHA-256: 687c5d98da7630a060cda9be60a65c52cfa00b089e0e618ab36a34c0325d205a
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 11304 bytes
SHA-256: eae6e986a9242669d8834a333c3cdff90c27badffdafc65d783be7cacf8fa55f
font_02_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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