Malicious PDF — malware analysis report

Static analysis result for SHA-256 7627cbd3ba588b4c…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 10:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d05df362982ead6edd41615398d527a1 SHA-1: 59c7da7f3bee00531e6cc25e20875e3217c1dc00 SHA-256: 7627cbd3ba588b4c8520587a7c5656ae7bcae4389bda8dd95feb221b4414bac7
244 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by multiple heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it contains numerous links to external sites. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded links, particularly the one to 'crophysi.ru', suggest a phishing or redirection attempt to deliver a payload or lead users to scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/award?keyword=pdf+taxation+cfp+exam+papers In PDF document text
    • https://rodefakuwutepez.weebly.com/uploads/1/3/4/3/134341390/veporapuvowitelija.pdfIn PDF document text
    • https://rasaputale.weebly.com/uploads/1/3/5/3/135323831/pagixelof.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/d8302cad81.pdfIn PDF document text
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/4076462.pdfIn PDF document text
    • http://pemarozelim.iblogger.org/chassis_design_milliken.pdfIn PDF document text
    • http://favowavuwoxi.iblogger.org/rutejiziduraluwima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawozovikoruros.rf.gd/dufabavutu.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_d010e41285cf4495ae899f5488db5d5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/marvel_heroes_online.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_b79f9fffad21432082cebbad953c43b8.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_e09ee18392bf422b96879aff49ac4b2e.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_1dc54d40011c48ca9301b132b33b8864.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_3da08c1735b04294948b17af135126ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b840c69b-875e-47ac-8c12-550fd74d8f40/vozafogarewozavemu.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/does_extreme_report_bot_work.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_7b9def8845704cb0a4f13f35f110fb27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d033f6-978f-40e4-9030-db37f207b34d/dirt_devil_endura_express_upright_vacuum_reviews.pdfIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_43a9e24be5114052811b0988455347fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/zitiwosivebalumosunagapi.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_d0dc79a224fb4219bbd0f408f054d303.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/amma_prema_songs_naa_songs.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_6222a6951ac34ea999078fa585f6199c.pdf?index=trueIn 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_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 5336 bytes
SHA-256: da6b3d800fe99eb8466db04b7eb42393581bf6baf4857c45dbf8b0362920a894
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 11408 bytes
SHA-256: b2e100aa9415735596c36f42baf79eadc91f5024de1ed11de6b44be0fe1adda0

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