Malicious PDF — malware analysis report

Static analysis result for SHA-256 313fa909f0154eb4…

MALICIOUS

PDF

71.5 KB Created: 2021-06-06 05:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3b4bb1152729f9d92e50ec2150fae48c SHA-1: 28a0f3672bdab7b2d28cdf33dec9f7825c6d713e SHA-256: 313fa909f0154eb4fa3f12d4de28ab2d893a2278a633039474693bd0b3634a81
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external URIs points towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/pbw?utm_term=loyalty+and+disloyalty+pdf+dag+heward+mills PDF link annotation
    • https://nogorixarolixi.weebly.com/uploads/1/3/0/7/130740589/8844422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_60b94dcf80bac.pdfIn PDF document text
    • https://kokarino.weebly.com/uploads/1/3/5/2/135299240/natiwaf.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/ximenewojujapil-safojetotusi-vovetajajudoguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60160bb83ebb2.pdfIn PDF document text
    • https://jafamolim.weebly.com/uploads/1/3/4/8/134872769/e0c379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_600c9096226fd.pdfIn PDF document text
    • https://galavalo.weebly.com/uploads/1/3/4/4/134464717/xevosawox_sumiselalafewu_keraxitiwajowu.pdfIn PDF document text
    • https://tukitesajore.weebly.com/uploads/1/3/4/8/134891371/7010618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6016fba48fc6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477878/normal_601a16067ee42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_6064010287354.pdfIn PDF document text
    • https://mitebisaxu.weebly.com/uploads/1/3/5/3/135395238/xiwizaredaloki.pdfIn PDF document text
    • https://kobuvenaxoz.weebly.com/uploads/1/3/4/7/134762740/38f2943c45a326d.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/1274472.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/1d085962-9b80-4e2d-aab6-bb6a797fc4e1/56434043733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a26be5-851c-4dc2-a87d-18d7fbd73e3a/nakajedisasatim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73727e8-33b3-441d-b02a-8fd00f948630/fozaribakazirorofefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a22a98f-0137-4492-9c4a-1afac29a7e4c/bajirao_mastani_movie_free_download_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245c30b7-b7a0-41dc-8a5a-c8ae58ef0e20/14563166052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d93744d8-1bf4-48ef-88b6-c094975d1bfa/diniganam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d85923-5822-4b11-a478-95415aeddefd/45953729732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57237ac1-3180-4b34-8035-9c30da7679b7/ted_wells_report_dolphins.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_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 5592 bytes
SHA-256: 0d0c08686ce260bc153996260927740b47f698012f6836d599b32f48e7f910a0
font_01_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 11140 bytes
SHA-256: 740e5888ac543732f1e6241ab9199c74cd6372e6a69597d90e116f49785be766