Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0377c4c6bc42ca…

MALICIOUS

PDF

76.6 KB Created: 2021-04-01 01:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7e8c8116dc60b7687bc1e022e9b124c5 SHA-1: 252aee3c81406dad7a9316d08200f0051848199f SHA-256: 3a0377c4c6bc42ca529793a034c0f617e1cee20352801f51d61a87bb43d668c9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to a network of linked PDFs, potentially for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=calories+in+one+taco+bell+taco+supreme PDF link annotation
    • https://ninurakabo.weebly.com/uploads/1/3/4/3/134324479/f6b3ecea951.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/hbjb6RY/48951934973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_603f65c6322b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fd661d438d1c.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/saxon_algebra_2_online_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_600b79fd1d3f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449392/normal_5feb1aff5964f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6044cd463827c.pdfIn PDF document text
    • http://sirunome.mypressonline.com/27_amendments_quiz.pdfIn PDF document text
    • http://jisuvakuwiraza.medianewsonline.com/will_fifty_shades_of_grey_be_on_netflix.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/acog_pap_guidelines_algorithm_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475016/normal_6004d943828c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_6064e95a45af3.pdfIn PDF document text
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/9326194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fc9489413407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_602968e6ec0f8.pdfIn PDF document text
    • https://korudodigujoko.weebly.com/uploads/1/3/0/7/130740169/7516069.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/iijhhe8/pilorabizedotaguzulo.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/7eeb0756-d744-4cdf-885e-e0da826a017c/when_can_you_put_houses_in_monopoly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7b3ccb-bbf5-479f-b435-4ee2bebd8119/how_to_turn_off_apc_ups.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c8c80a-0853-424a-8db4-8303535eab21/vogatamefurunebib.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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 5124 bytes
SHA-256: e599ae831b7bc0b1c1bb58335d89fa74c525bb72c2ad7e419a1f123aa2ce1d4a
font_01_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 11176 bytes
SHA-256: 1013f2dc6bdd90e01e98e44bae63f5e0ecd7d33fee64c985e219764a513a45c5