Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a3426646e5e555…

MALICIOUS

PDF

66.8 KB Created: 2020-11-17 10:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d337edb52a3f819a701396764b33488b SHA-1: 259add1fb383754c70cb2b62aeacbae634fddc07 SHA-256: 50a3426646e5e5554e81087d42f9154c90edd69a6e454e1d62415c4525639004
156 Risk Score

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 0.9997

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
  • 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://trafftec.ru/123?utm_term=the+perfect+tower+guide PDF link annotation
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/naniro.pdfIn PDF document text
    • https://gafekiwukuwemul.weebly.com/uploads/1/3/4/3/134313713/ef16c77d67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5f98178529813.pdfIn PDF document text
    • https://benerema.weebly.com/uploads/1/3/1/4/131408328/zobejupukep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8a5b718ec7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_5fa23e79448a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5f9dad209bac4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1780cee3-b3f7-444c-95ac-7778babadf73/lekevuguduvifuxobeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbbd4a9d-1321-486f-a1ac-d6667a507c23/kereparobepetititemuwujuk.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/bullet_force_unity_blayze_games.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/adverb_examples_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/building_firestore_powered_ionic_apps.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_off0000c916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC916 5040 bytes
SHA-256: 1b5eeb939118ebc6eb0797ca4ca20cf5ccd9bfcbe233ca3b8c454ebf43f1c191
font_01_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 11056 bytes
SHA-256: 05935905f965be57aa0ed004e7ba832e2b0a222e27bb5d41fe3dd08f8c64fd26