Malicious PDF — malware analysis report

Static analysis result for SHA-256 494997f93385c942…

MALICIOUS

PDF

87.9 KB Created: 2021-03-21 22:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5304da32cb58eefeec73b118d1bd6a64 SHA-1: 99ec96e4f3ea3643f49db97c4f4886f428f36a47 SHA-256: 494997f93385c942af4cc43019189ddc4cc729ccf8943bacc742fb4e3313fe90
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=birthday+girl+murakami+pdf+download PDF link annotation
    • https://cdn.sqhk.co/ruwonumatag/wPhizjj/arrow_going_left_and_right.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/rYgdzhc/jogotaboweduxelepem.pdfIn PDF document text
    • https://funapimezu.weebly.com/uploads/1/3/1/0/131070883/9535443.pdfIn PDF document text
    • https://lolivifi.weebly.com/uploads/1/3/0/7/130739590/6083368.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/34808163235.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/98638258594.pdfIn PDF document text
    • https://notojusuwetu.weebly.com/uploads/1/3/1/8/131871856/affe0.pdfIn PDF document text
    • http://denarop.22web.org/how_much_is_agile_certification.pdfIn PDF document text
    • https://lefaxujil.weebly.com/uploads/1/3/0/7/130739779/budetenabedu.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/icibrRT/happy_national_hockey_mom_day_2020.pdfIn PDF document text
    • https://pugotaba.weebly.com/uploads/1/3/5/3/135302821/8612137.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/373f8073-d9f4-4d2a-858c-7a631aeee9b0/john_deere_d140_engine_problems.pdfIn PDF document text
    • http://wasumulavubusol.epizy.com/obsessive_personality_disorder.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_d1cb5fb58e62403cabaa919690c56354.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65597c5f-be56-4291-a3db-169920a7f920/what_kind_of_engine_does_a_2005_ford_focus_have.pdfIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_5f8d0b0ed9784d12881a1ffb91431474.pdf?index=trueIn PDF document text
    • http://kekunulu.epizy.com/85879980897.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/aircraft_seat_design.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/pozevi.pdfIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_ab0dd965370548579cdd27b140213c50.pdf?index=trueIn PDF document text
    • http://selifesupenikiv.epizy.com/gathering_dreams_income_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913e7be2-3623-4871-8d18-5076b9e23a82/jaxojizodavezemaku.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_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 5584 bytes
SHA-256: 7191dd3b7b17e2f23330e05f3f3066f71d792d3e479c022fba162afa431e0016
font_01_sfnt_off00012f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F46 10336 bytes
SHA-256: 8cb29816fc000c208d6afec80a205f9430306599bf056b672dafbd3e35e88014