Malicious PDF — malware analysis report

Static analysis result for SHA-256 5793eb24551804dd…

MALICIOUS

PDF

78.9 KB Created: 2021-05-22 05:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 54acc39e52189893dcce2a6d857d3bff SHA-1: e9b1ea78750b53df15582735f3100d1a7cb42374 SHA-256: 5793eb24551804ddbf13b00effeb2401de2a6a288441ca0eb6aa65a1db7544f7
206 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest the document is designed to trick users into interacting with malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://golowaki.ru/strik?utm_term=how+to+manage+a+1099 PDF link annotation
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/fupunubasotun.pdfIn PDF document text
    • https://bujubilefo.weebly.com/uploads/1/3/1/4/131406518/8a50fd5c0.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/zozesanepuges_kobojesaxar_majut_wifepe.pdfIn PDF document text
    • https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/75c13028bf3ba6.pdfIn PDF document text
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/rufapilujem.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/4652225.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/sepulo.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/6fee1f.pdfIn PDF document text
    • https://minezutoka.weebly.com/uploads/1/3/2/6/132695516/neduwezajekejiruxaj.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/fe64dd49eaf.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/livujaneviki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dumupa/50939063773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c961b22c-e023-439e-85e3-dcf7ca2e645b/percy_jackson_and_the_sea_of_monsters_book_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce4cbd9-3bf3-477f-af99-045d7a6b776d/5913667746.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/tasomoxodipug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ed279a-4c94-4088-8494-4fde572fd823/56615351588.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/tatamolulagoxefitede.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/100_tamil_movie_free_tamilrockers_2019.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_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 5100 bytes
SHA-256: 3f8b31ef01ff848dbdaf813e86b58206a3429da65daf6068c955c0fae7c29ea4
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 11064 bytes
SHA-256: f6c391355f12d703e58837f7fd268bc8b9e0086f300940851794a65a24c7cc0e

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