Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df9087823e44a8f…

MALICIOUS

PDF

87.2 KB Created: 2021-03-14 01:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4bfa30ffcec4a24f0e6b5332469ff37f SHA-1: 5cea3cdeaa1941e786d38b6b82263c55ad82b8e3 SHA-256: 6df9087823e44a8fc775d1e2937e9552cbd4496cbdc33c38a4dd29cd8ef46c09
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 0.9997

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://xezojetit.ru/award?keyword=basic+bodice+block+pattern+drafting+pdf PDF link annotation
    • http://item-get.top/baldwin_organ_schematicsvgbcp.pdfIn PDF document text
    • http://usesoda.pro/gomoku_strategy_guideoxwnh.pdfIn PDF document text
    • http://ejqy.com/paferuxunexazami2ixhe.pdfIn PDF document text
    • http://xajaweronasuxo.22web.org/32977028709.pdfIn PDF document text
    • http://tehnotop.space/hockey_fights_ms_2020n7qgd.pdfIn PDF document text
    • http://changely.club/will_they_remake_mgs1rds6l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d5870111-e8aa-47a2-b93e-d537eeb8ecc8/81033660751.pdfIn PDF document text
    • http://gizenelik.rf.gd/19762999579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34da8673-e71e-45e2-8643-af139b9daf06/nutrition_facts_for_the_impossible_whopper_at_burger_king.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b0fb4c-fc20-4ceb-9658-ef480c78d9cf/riludisopikinexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9794244-444b-4bf1-aec3-f7aaf07a7f91/rojorixovubovevivujepagow.pdfIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_ec39c0eac12342cab3d0a46ae0d18b18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/080984da-f05e-48db-8967-7a225e5c5cee/fusono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7fd20d4-3bac-44a6-8d4d-fdeb14ffcbd1/podadonowekamelil.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_e3b70bed2f15443f9d7b067f72b76257.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d955f6bd-b696-4cb3-a541-ec0442a46f7d/what_are_the_major_conflict_resolution_techniques_that_can_occur_on_a_project.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_d14d436e592b46c98ec93a15ed1dbd57.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_723ed2d0c7504c3784991bc3b10ecd03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b31350-4f4e-476a-a404-639f6373efcc/kapikerozeloruzotomegek.pdfIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_68582f3c3625449b926e2f3c50bcc0b4.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 5364 bytes
SHA-256: ea4561fe498b77df983aa96f2be55a29a9e67de9c743e3869f109eccb410aba7
font_01_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 10560 bytes
SHA-256: a8afeb45082725a293c4cc75e51025d667468dab9318cfe86e86f83fdb04b6a5
font_02_sfnt_off000140c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c