Malicious PDF — malware analysis report

Static analysis result for SHA-256 1960ac6507aadb92…

MALICIOUS

PDF

67.9 KB Created: 2020-11-19 22:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 51e46cabbd7d440011879bef49986fd4 SHA-1: 7b2eacb07b2c253d342c1ae67b5ab809e447330f SHA-256: 1960ac6507aadb92860711e6a29b331972bf53709efd1cae4dc7bb003f2822e0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which are disposable hosting services. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=stomp+out+loud+video+worksheet+answers PDF link annotation
    • https://jibisovewa.weebly.com/uploads/1/3/4/6/134653871/af2ef5.pdfIn PDF document text
    • https://lupogupep.weebly.com/uploads/1/3/4/4/134444844/saxopevef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f93493ab42cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f94a7ba538e7.pdfIn PDF document text
    • https://dedeluruxizo.weebly.com/uploads/1/3/4/3/134305162/6827589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f8e60ee4ba18.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/zediluwi_getepose_tesuponigima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5f8b550921c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fa5f673d5f14.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/916016.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/1649241.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/xedobox/rich_goranski_bmc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6b4ec0-d43c-4d44-9ef3-726a870d983b/questes_sobre_totalitarismo.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/the_last_stand_union_city_hacked_all_items.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/85887715736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f70f7b5-a31b-46cf-8aaf-3154af797a3e/89743780336.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_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 5516 bytes
SHA-256: fe006669964e6b6279c86f7898f82d05fa89327e28811189f3d8b8c1cc0c4632
font_01_sfnt_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 10648 bytes
SHA-256: 191d6d43a091a7a57eb1a929004068ba4fa7bf0939419a2058d6fb49e2ec9886

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