Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ee5eb7bf47778d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 19:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20ea129e59bd6e2416bd6d4c8188a791 SHA-1: 5ee00f69e10ae504a637842d1a569445f1e81c6e SHA-256: 73ee5eb7bf47778d8c5044c8303b84a4ce0e6bb03a18b2264e1768877f5c4900
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 0.9948

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://crophysi.ru/award?keyword=bando+fan+belt+catalogue+pdf PDF link annotation
    • http://zaxevef.getenjoyment.net/zaloganirinenivebanarow.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/mhajbec/3d_werewolf_model.pdfIn PDF document text
    • https://nenojidadexodu.weebly.com/uploads/1/3/4/3/134351563/4818878.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/matlab_programming_tutorial_for_dsp.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/ijA2Xhe/37732487414.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/ghjgoPd/potizotunarorowaraxedu.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/strategic_positioning_definition.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/2c0b7d79.pdfIn PDF document text
    • https://cdn.sqhk.co/rapaxino/dggeM0z/yeetus_the_fetus_luigi.pdfIn PDF document text
    • https://xolavubapipivuk.weebly.com/uploads/1/3/5/3/135302485/puzaz-turerojo.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/ibYiGkE/superheroes_playground_human_ragdolls.pdfIn PDF document text
    • https://ruwevupezo.weebly.com/uploads/1/3/4/0/134013147/pizavasanuxisa-vasevuzagibidiz.pdfIn PDF document text
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/lokavekowuk.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/86923730816.pdfIn PDF document text
    • https://xotomunekezej.weebly.com/uploads/1/3/1/0/131070571/6502234.pdfIn PDF document text
    • https://merokiniperoj.weebly.com/uploads/1/3/4/6/134691049/df06a166.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/durgasoft_core_java_interview_questions.pdfIn PDF document text
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/vetugug_sobobazopabab_feresuvofiri.pdfIn PDF document text
    • https://tabofeluraratub.weebly.com/uploads/1/3/1/4/131438776/69ab7e5.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://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_291dc91bdcf64bceb4b1c4e3d3553881.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_8dea486f22a14775b8653b5c8e79ec01.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_d3ca34ff60e743fdb4763bd64fc0b002.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_7c67d334f301457aa7319cb9bf9285ae.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_ea1ce044c4a44337821691f1b4d7aaab.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_eb29fc1a325a478e83b01a79e25f6739.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_b2459dc61a9d42c0877c579203bb7f4c.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_59b11cf51661407b8d3529068d9a409a.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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 5072 bytes
SHA-256: d51e61fdf4fd449f559df43979adcc2bb640eeb032b608a05a348b4e77db65ac
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 10780 bytes
SHA-256: 6a7f8a89516fc25e79991c0bc49ace83abbb88fabef9cf45793b8631055379fb
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378