Malicious PDF — malware analysis report

Static analysis result for SHA-256 703567b93ef38423…

MALICIOUS

PDF

75.5 KB Created: 2021-04-29 17:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe74e0419392d3c2ac32355ad74998f3 SHA-1: 4caf957ed445caeacec4aa789282c4b3ec566678 SHA-256: 703567b93ef3842368ec97a3a37fe094a31d05a78c0121aabee279523d7d6726
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. These links likely lead to phishing sites or further malware downloads. The PDF itself does not contain readable content, but the heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=d%2526d+5e+rules+pdf PDF link annotation
    • http://cherrypimp.online/7mm_rem_mag_reloading_data_150_grainpn90d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366961/normal_5fcbff96d5e54.pdfIn PDF document text
    • http://presentinsta.site/driving_learners_book_malayalamjpzc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5ff466148c5a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_60523826d9fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd657f3d085d.pdfIn PDF document text
    • http://znatural.space/dark_souls_2_ps4tmaxg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365591/normal_5fff65784c7a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_604cf8f439295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_602d4a083559e.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/3967645.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/6106955.pdfIn PDF document text
    • http://life50it.pro/application_form_korean_embassy5swz6.pdfIn PDF document text
    • http://cashbackk.site/lipivesulikfejhj.pdfIn PDF document text
    • http://baby-slings.ru/vupulugenuwexafomcy6u6.pdfIn PDF document text
    • http://universe1.space/this_is_living_hillsong_chordspb9zh.pdfIn PDF document text
    • https://zozizifubigidoz.weebly.com/uploads/1/3/1/4/131409074/51925d41c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_60143d7f84909.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/wekibik/nikon_f50_film_einlegen.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/agrobacterium_transformation_in_arabidopsis.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 4156 bytes
SHA-256: d9d9eb8b5a67a8494ca5a9593d54773c41ba913a17cb426b52e0a193c0b11448
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10784 bytes
SHA-256: 82472c8a1d441b595e4459a09cece9b3fa3e2513fe1c513742e982ea1cb1ca66

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