Malicious PDF — malware analysis report

Static analysis result for SHA-256 085d5ae477b9a078…

MALICIOUS

PDF

89.2 KB Created: 2021-05-03 11:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 87144bd2d97224733b95dab0a9838a6b SHA-1: 2017c843a9f408b8d8cc8e739b1352434eb0d87b SHA-256: 085d5ae477b9a078d82d67d92cc02b39945d8f5b43ff7ed608d1e9d798be11df
86 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to potentially malicious domains. The document body, though heavily obfuscated, suggests a lure related to 'Us postal services international rates' which is a common theme for phishing or scam documents. The presence of PRC/3D content and a link farm heuristic further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://kuzutuzo.ru/strik?utm_term=us+postal+services+international+rates PDF link annotation
    • https://sipopupomiva.weebly.com/uploads/1/3/4/3/134307082/pomidudor.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/basic_electronics_notes_download.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/prokaryotic_cell_structure.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/javot.pdfIn PDF document text
    • http://yesnutural.space/256560333938sash.pdfIn PDF document text
    • http://goodsun.fun/how_to_charge_my_passport_wireless_pro54d46.pdfIn PDF document text
    • http://kyukty68.xyz/solution_manual_engineering_optimization_theory_and_practice7ozim.pdfIn PDF document text
    • http://vumejopiraxu.mywebcommunity.org/cambridge_english_advanced_1.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/5408556.pdfIn PDF document text
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/8536471.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/jukatipumepasepi.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/d3yswg2/mokanaremix.pdfIn PDF document text
    • http://oneplusonemain.xyz/nordic_track_pro_manualyqmqu.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/fgdjhgi/4731072860.pdfIn PDF document text
    • http://fit-italy.space/how_do_i_know_when_my_bluetooth_headset_is_fully_chargedchwta.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/a5bd6.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/haZghgg/yeetus_the_fetus_deletus.pdfIn PDF document text
    • http://voicebftyi.com/14206933128pzh5w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvuxejuv.myartsonline.com/15234439727.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/implant_surgical_guide_planning.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/1855646733.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/keychain_mockup_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/44558424429.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/51023980452.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_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 4976 bytes
SHA-256: f3d246d3a90b34811b8f0e04309435d662333335df27518417d98d24692e31bd
font_01_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 12004 bytes
SHA-256: e1f8bdc934fe92c0c0addc7d8d0a9659b9ca54e350055a2cd100c827a232ac85

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