Malicious PDF — malware analysis report

Static analysis result for SHA-256 688f3660e4c90885…

MALICIOUS

PDF

68.6 KB Created: 2020-12-14 22:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 286cfea222327a06b1ad79d0e17bb5aa SHA-1: 74352f0420541e7df28841eebc60678681ca8832 SHA-256: 688f3660e4c90885ee9b6ae4f45d38f2b04208e22913665921019ee1b0f72726
214 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points towards a potential delivery mechanism for further malicious content.

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=chevy+trax+reviews+consumer+reports In PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/2637506.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/3567234.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/e827d76de99ce9.pdfIn PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/f4967c6ed2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc78d8be9133927d90f7fcb/t/5fcf75c168c18617d412d974/1607431619083/20425599282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ceea1aa-b897-4f25-92bc-e655de334420/buy_google_voice_accounts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72659d1-1e9e-431b-9602-2b4615e6f2bc/46972016649.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/lofuwamubisepoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5c1bc4-af4b-46a0-9700-237143c0a481/45716260045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51675fa9-9add-4914-b344-ff3a38e0a22a/athlean-x_max_size_workout_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29253a3bf4b14abb3bccc/t/5fc37bb0f8cdb769c64ff02e/1606646705454/dirt_bike_information_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02da8170-f569-417e-a04a-cb7e181912d5/sonic_flash_games_online.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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 5368 bytes
SHA-256: b23125614ca26aae10186d4410ecd3fd9725cca89b2bc0b6a2c8d4f094196e87
font_01_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 10536 bytes
SHA-256: 93e4d7ea161d19e7ec64ee918f340dd49ec753ba8178ed4159ea8d214c0996af

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