Malicious PDF — malware analysis report

Static analysis result for SHA-256 9864da87be3d3416…

MALICIOUS

PDF

85.1 KB Created: 2021-04-01 19:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7afe25bb90e546c7077c6139698e8cd4 SHA-1: bf7e20e1c252c8d91945e81327fb564145df72e8 SHA-256: 9864da87be3d3416a66010089844e7b11050f23b3cb31873eff590a4c117097f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://fokemale.ru/wix?keyword=engineering+statics+study+guide, which appears to be a lure for users searching for engineering study materials.

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://fokemale.ru/wix?keyword=engineering+statics+study+guide PDF link annotation
    • http://pazefezos.mywebcommunity.org/pulling_back_the_shades.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/ziwufoxovikami.pdfIn PDF document text
    • http://sks-expertiza.ru/c_type_deduction_guidesvbli3.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/20782146167.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/aAii7kp/ballz_shooter_mod_apk.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/7b559db51d49fd3.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jj9bqE8/sugar_land_sweet_match_3_puzzles.pdfIn PDF document text
    • https://gobitinu.weebly.com/uploads/1/3/4/9/134902795/9daaceac488.pdfIn PDF document text
    • https://cdn.sqhk.co/busudijul/hz85FAM/napelusowotefagal.pdfIn PDF document text
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/labob_ruvefiv_punexisex_sipegekerewo.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/ruxav.pdfIn PDF document text
    • http://profibrend.ru/momezakawo8e1f2.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/hjujejh/sprinter_upfitters_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/hWieGlG/fosasupivifazatitan.pdfIn PDF document text
    • https://cdn.sqhk.co/wudenedu/fhaJja3/99978636475.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/ercVjdw/ted_bundy_death_row_interview.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_a0ff1c903ece49ccaa7924fd14cf00ae.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_a28c606702a84e6cbccf0edb602e6ad2.pdf?index=trueIn PDF document text
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_a6812ed936bc46d1b5081e08623aef19.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_77c0879c673a48658bcb96bde017db79.pdf?index=trueIn PDF document text
    • http://fepusum.onlinewebshop.net/virgil_aeneid_fitzgerald.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 7156 bytes
SHA-256: fff068ce50daf747bd3f95b532dcbed70265b683d88a8f831ed4d1db0cd43ca1
font_01_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 5132 bytes
SHA-256: 0b046f9de65fbde67517b40faf2b07676371d81ca5e43a92f05b75de666c47d9
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 11048 bytes
SHA-256: 245de98ada540d096fa09518f029afe3e453499c625736ae601579bad99ae3c6