Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc3a61c7e42052f…

MALICIOUS

PDF

67.5 KB Created: 2020-12-20 19:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 94606114eab05f1912c732f8cbf7e9e6 SHA-1: c87d0c4b712b03bdb7c0c5f50f037c8ec6278e19 SHA-256: 4fc3a61c7e42052fa458f94fcc614679cf5cae6368ee15654b6cc76b80d82a44
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to web templates. The presence of numerous external links, including a link farm, suggests an attempt to drive traffic to potentially malicious or SEO-spam sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://traffking.ru/aws?utm_term=about+us+page+template+in+bootstrap In PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/gefodovexa.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/5fc07dde27a199023ab34438/t/5fd04ec412264b5dfdc87a50/1607487173521/lisepoxizaxipokujuwer.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b49c60f2895dc108b686/t/5fcbc45e9cf56e0e8b19fd16/1607189598292/21828702609.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f4078787e879896c419e/t/5fc398f89ee0f32b87c2083e/1606654201289/chinatown_board_game_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b34d3c0-31ab-437a-aebf-a01f94346547/league_of_angels_heaven_s_fury_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3db3859-652f-4d33-83e0-0166a4d746cd/nusisorapukujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5dbacbf-6aeb-42bd-be32-3139f3e35b62/32324111318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28dbf582-1250-4169-8556-68d0d5e30632/2752989004.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/15793184935.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_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 5268 bytes
SHA-256: 0b4ca030409fff16594c44d56db73ea46857aeb832d57588f9dd297f20cab160
font_01_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10724 bytes
SHA-256: ee505f4e190e28759f950d71ef0c7f79ca00a01668790132832befe384591993

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