Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf52c2a1b61e6c9…

MALICIOUS

PDF

69.7 KB Created: 2021-02-05 14:12:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b372be33479970cc0f13a5aef9ece789 SHA-1: 69405ac70d9d455abeb6af2b4b35f03e0a3c2c13 SHA-256: bcf52c2a1b61e6c97e9cb299b882e938f079121cfba58eae99ac43ac97288aa9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged the file as malicious, specifically as a phishing trojan. The presence of numerous links on disposable hosting further supports a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=irs+charitable+lead+trust+form In PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/zopuju_lozemexor_wapoluduvawem.pdfIn PDF document text
    • http://copyrightram.net/46621576257durd2.pdfIn PDF document text
    • http://tramlaweq.online/centrelink_appointment_of_nominee_formxifs0.pdfIn PDF document text
    • http://ekzo-fruit.ru/samsung_marketing_strategy9guey.pdfIn PDF document text
    • http://gomotejux.iblogger.org/resujiwagulefil.pdfIn PDF document text
    • http://dkmz2.club/ariston_hotpoint_washing_machine_manualno6w3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_60194f2025ee1.pdfIn PDF document text
    • http://straponartist.com/38237520771c5upg.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/tinuzofozobemiro.pdfIn PDF document text
    • http://arenaprobet.com/ejercicios_de_completar_silabasu12or.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubixegigag.rf.gd/84043151583.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/xagubu.pdfIn PDF document text
    • http://rapuxatidugek.epizy.com/nugojowarukisuri.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/junafolusodovom.pdfIn PDF document text
    • http://pababevo.epizy.com/the_breakdown_b_a_paris_free.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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 5340 bytes
SHA-256: e1ea3d653676bc0691d28b4f76469724ec3b900cc14ded4e9eb6beb181d091e4
font_01_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 10344 bytes
SHA-256: 536adf0d23d33a34d9a79a26153bb547b5e10ead99b59e2e7b5188db4f6df2ae

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