Malicious PDF — malware analysis report

Static analysis result for SHA-256 746dc71e207b3f44…

MALICIOUS

PDF

79.2 KB Created: 2021-05-13 01:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eb1bb56e6979b3abf18f7ec0054f88fe SHA-1: 4edabd822c4ebff1fea8d12c1cead476e130aefc SHA-256: 746dc71e207b3f44c8ceb9d1250d3810fb0c6147ff24ab9e6a09bd851be8cf59
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs, many pointing to disposable domains and employing UTM parameters, indicating a link farm or phishing lure. The document body, though heavily garbled, contains references to 'wkhtmltopdf' and a date, suggesting it was generated by a tool rather than being a legitimate document. The presence of numerous external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pelibifir.ru/strik?utm_term=what+are+the+6+phases+of+the+intelligence+cycle PDF link annotation
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/5f2c8ded9adf675.pdfIn PDF document text
    • https://cdn.sqhk.co/goxepijikun/Gjgvhhg/xirolokofaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_605afcb4f0c67.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/71290526840.pdfIn PDF document text
    • https://jamelowo.weebly.com/uploads/1/3/1/6/131606155/3458491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_6048e11ab0c34.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/506068.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/85469762662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_60231329bd2c4.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/bafirota.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/fuwepup.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/hfxzChh/15528428489.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/vifapu.pdfIn PDF document text
    • http://lusuwivaw.medianewsonline.com/traductor_de_documentos_de_aleman_a_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/jhhggig/cooking_mania_food_fever_restaurant_crazer.pdfIn PDF document text
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/3382160.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/BWhhooA/paintball_gear_for_sale_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418762/normal_5ff845867feb4.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/73858360599.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/5176345.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/43376859519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e1c2e9-7f47-433c-a3be-8a96cb58f2bb/dulobalipazugidejipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bef4378-0087-460a-a63c-394934faefe8/how_long_usps_customs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c50c6f-d912-439a-af78-3868c7bb1867/how_much_is_a_verizon_hotspot_monthly.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/les_barricades_mystrieuses_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ee464c-823e-4639-8bf6-ef438e662f92/how_to_turn_off_the_beep_on_a_kenmore_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8aab96e-c11d-4997-8386-cbb253d509a4/15022559306.pdfIn PDF document text
    • http://kipazafar.atwebpages.com/bidizevetujilikup.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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 5544 bytes
SHA-256: 728993be2df9edf4c0000f6f23e200fd85f3e77d04748898abf08f1b78cf78af
font_01_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 11156 bytes
SHA-256: 4331b5c85c3511ae84764fc883f84a6e1652d83f772cb493bc91f9b7867d3781