Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fbc21f7c229882…

MALICIOUS

PDF

89.3 KB Created: 2021-05-13 16:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b08db3e222941f7f5fd0584818a89069 SHA-1: 2782968c62c87dd24d19b0d277283f67525226ae SHA-256: 40fbc21f7c2298828f13bc7cadc52ac5866ac3e799d25c8bc6083956ac35d887
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://seumenha.ru/strik?utm_term=hitler+nuremberg+speech+location', suggests a lure based on search engine optimization. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

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://seumenha.ru/strik?utm_term=hitler+nuremberg+speech+location PDF link annotation
    • https://koxepaje.weebly.com/uploads/1/3/5/3/135350813/c94e1d9a67.pdfIn PDF document text
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/zudapiwef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_601b70405f7de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60652db08b9d7.pdfIn PDF document text
    • http://carbags.site/samsung_un50h5203af_manualy82el.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/67693375457n5xf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445882/normal_5fffda4520c36.pdfIn PDF document text
    • https://kivexobine.weebly.com/uploads/1/3/4/8/134859900/dbca118f0f247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5ff0ce375320a.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/b26720e81aaf.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/8668613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478123/normal_5fe5b0bc886f6.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/84698811484ej8z1.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/f846601b-65d5-46c9-abce-9f7020fe2ddd/nemabevorowekodidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c610bb4-b171-44d8-b4e2-cf7aed935dfa/dias_feriados_pr_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985c327b-9372-4f3f-a636-c215dc63c27a/how_to_use_whirlpool_washer_without_agitator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4854acf7-d79e-4f85-92d5-69f104ff5798/list_of_us_army_special_forces_units.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e86bfa-3b73-4a95-bf97-bf893bfb1b00/rixupudagibuxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fce402f-dab8-448a-af38-453f1d31ab29/49633343299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b3b664-50c0-4543-b252-86f6a86ae4e2/list_of_senior_management_job_titles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc9c346-c491-4a3c-9658-dd72c83620ed/alkaline_based_diet_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a4a5ba-386a-4565-8156-f1db9e5d3940/israel_kamakawiwoole_somewhere_over_the_rainbow_ukulele_tutorial.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_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 5448 bytes
SHA-256: 57bf415a777da1af3cdd2688c3f0c3d79ee385db36893bc32b272b765b797aa6
font_01_sfnt_off00013056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 11776 bytes
SHA-256: 88fbb97fc014154b2ef6986da26753bf0bf781aee072b64dddb804e1ae4bcff5