Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b23df09d10c353…

MALICIOUS

PDF

146.5 KB Created: 2021-04-02 23:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f7c9a4a4e697acedce7e5b0aa737d00f SHA-1: ec3caad33f11f521c4cfeff8745e513919af8af1 SHA-256: f8b23df09d10c35320cdb4ddea59ca19c84df5b2791dff70e23059b54b35fb59
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous embedded URLs, one of which is identified as a malicious redirector, suggests the primary attack vector is likely spearphishing via a malicious attachment. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+other+side+of+the+wind+review+guardian In PDF document text
    • http://mojenisijita.mywebcommunity.org/26772591464.pdfIn PDF document text
    • http://turubegu.sportsontheweb.net/because_he_lives_hymnal.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/bamotasurazonubijiwa.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/pabakeramitawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_6029aa0bb2f0e.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/lotubulonazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_5fdc1ff002432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_6025b263e6f60.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/89c7e6b2-bc91-47ce-a076-a1affb57c949/cessna_310_operating_cost_per_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17eeb7ad-01b3-432a-8130-f7257c4e07a7/acordes_de_piano_basicos.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/23131101604.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/dotadidum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d013984d-6353-49af-ab20-884a190e64d1/55544129210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead658a0-0ed7-4441-a695-5de4076bf861/ic2_manual_kinetic_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ddae80-bddc-4567-a6cc-edaae50c1d26/govinda_namalu_hd_images.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_off00020161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20161 5236 bytes
SHA-256: e55f50b1e390ac8c232040b3aab08eaa8b1e0db7588582855a6005b2a77361b3
font_01_sfnt_off00021341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21341 12584 bytes
SHA-256: b76f26ae5da811ed378d345c156516b2121fa9e7f0f1c68f5c69ec93a7b5f7bd

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