Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac85bd0f02be4a0…

MALICIOUS

PDF

86.0 KB Created: 2021-03-19 12:37:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67c52d231204dc3227385ae7a5d7a1b6 SHA-1: 9ef6e171560bd2d1a3d1f919eb2bef977737fff8 SHA-256: 1ac85bd0f02be4a03bfa94362a7c511d0f48312891e2062d68ab5191fe347746
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9994

Heuristics 5

  • 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://ponafet.ru/strik?utm_term=whirlpool+dishwasher+gold+series+not+cleaning PDF link annotation
    • https://cdn.sqhk.co/setuboluraje/iiiiBp1/ragozimujozed.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/gijgv6N/texas_unclaimed_property_reporting_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/eaj3Fid/golden_axe_classic_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/vunofufi/gemjijc/82470461799.pdfIn PDF document text
    • https://jovopunok.weebly.com/uploads/1/3/4/8/134869647/tumamonazov.pdfIn PDF document text
    • https://wanibezitajijo.weebly.com/uploads/1/3/6/0/136000154/misarupipo.pdfIn PDF document text
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/pomubajapejigew.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/lovatonik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_f999cbc5a8724a5a8adb2c78433c51e4.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_664e8b70547c441cbd1c89cbdf8d499e.pdf?index=trueIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_a2a94fd1873847a0beb5b813cca4d801.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a926f10-5eac-4356-834e-335557db8acc/crochet_blanket_pattern_for_super_bulky_yarn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7bd532-c60b-4fda-8b92-43fd50f363f5/66283071287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09898bb-a5a9-4698-938a-1cd29f6edeaa/koritez.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/maplestory_monster_life_combination_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3164b36f-3c5e-49ae-85d8-7259f80d4c7e/rifezopobebukawur.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/moxisisunil.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_0aeebfb945cb42ea9ce9ee56d1c60654.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8904ca38-b597-411b-a7c3-130dc035373a/what_was_the_name_of_the_plant_in_the_little_shop_of_horrors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edce7810-b1e7-49a7-b68b-16167fceda5d/they_say_i_say_the_moves_that_matter_in_academic_writing_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/33315752783.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 5440 bytes
SHA-256: a42ef9b7741b154c503190575b58b287b7296f64bd2f42382961d66fb6a75e87
font_01_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10888 bytes
SHA-256: 16042b40ff6ad988114a32871e9a7e1d6087db79cfa8b19ccd9018038c1f4bf3
font_03_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0