Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45056d35679cad0…

MALICIOUS

PDF

82.7 KB Created: 2021-04-27 07:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ec4b039bbd80bbaeb19eaec91b21ba0e SHA-1: 276c665a5dc4d714c06234cf6d7b7649935fce8c SHA-256: a45056d35679cad062f2e04d1c05775a1490090802e37d419db024580372dd79
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable or unknown hosting. Heuristics indicate it functions as a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm behavior point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=texas+ti+82+pricerunner PDF link annotation
    • http://sizijevoji.iblogger.org/orao_e_autoconhecimento_anselm_grun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_60322e0ca6c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_602c90da120cb.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/b8XjeJP/dimatipim.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/pHEiiET/zolawagubekuxejuwemame.pdfIn PDF document text
    • https://dusalunefawotof.weebly.com/uploads/1/3/4/4/134487283/dipafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487647/normal_5fd7a4c4c3941.pdfIn PDF document text
    • https://lukikusatagefu.weebly.com/uploads/1/3/4/3/134320254/naserami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_5fe94e9f28cd1.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/chiAibr/surat_al_kahfi_latin_dan_arab.pdfIn PDF document text
    • http://shoplus.info/22440009032uqaip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_606619a43aaab.pdfIn PDF document text
    • http://manthoughtswebsite.website/dusuvoa9ew4.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/71203508-14b2-42fa-80fa-ea3f6d6c8dec/zopiroxifusebe.pdfIn PDF document text
    • http://kopedug.epizy.com/how_many_dish_customers_are_there.pdfIn PDF document text
    • http://pofulexurukuka.rf.gd/75533500988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17051bbf-8439-4c83-b5c7-199a571f43f7/does_resistance_band_training_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9438b4-5876-4c29-a9c8-bc54aad885e6/wd_tv_live_hub_manuale_italiano.pdfIn PDF document text
    • http://faxowenifediwok.epizy.com/gulakonarobosisukoravoz.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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 5012 bytes
SHA-256: afa423bcdf2b2201d18b40aaff7aca3bdb55183471d2eefb7b973a43238f8e23
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 12404 bytes
SHA-256: 27beafe27d836301cc03618895a61162120e64517255d62b0d12a85f4c94b148
font_02_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 16228 bytes
SHA-256: afcf5f56b8784ba79214da0138968f8655fb39c2a6182ca6c16965fc2cb83e79
font_03_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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