Malicious PDF — malware analysis report

Static analysis result for SHA-256 04821458c95ff312…

MALICIOUS

PDF

37.7 KB Created: 2020-09-29 22:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4263a4d4acc9eb898334e60d33022ae1 SHA-1: a8bc14ee4b5a132738e434811bb2df583d1afda9 SHA-256: 04821458c95ff312614324a3641ce33d8b3ac00d1fa14aec8bfe0339d6e01ba6
122 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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://cctraff.ru/strik?keyword=exercice+verbe+etre+et+avoir+pdf+avec+correction In PDF document text
    • http://files.birdandblossom.com.au/uploads/1/3/1/3/131381109/tujakonos.pdfIn PDF document text
    • http://gobarus.tanyagjewelry.com/uploads/1/3/0/7/130738850/6345719.pdfIn PDF document text
    • http://sugexez.openthedoorleadership.com/uploads/1/3/1/4/131453558/dadixexoxovore_zezax_zigitetob.pdfIn PDF document text
    • http://files.texairamerica.com/uploads/1/3/0/7/130775762/nupapavazakosa.pdfIn PDF document text
    • https://site-1037227.mozfiles.com/files/1037227/geziwalagorinili.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/wujuboteze.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/weguwopomux.pdfIn PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/16767255932.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/digukegitoxusig.pdfIn PDF document text
    • http://bawube.jadepublishing.org/uploads/1/3/0/8/130814328/2474696.pdfIn PDF document text
    • http://files.roanclay.com/uploads/1/3/1/8/131857626/201b47b7fec6.pdfIn PDF document text
    • http://datedokix.excellenceworks.com/uploads/1/3/1/3/131379057/dubage.pdfIn PDF document text
    • http://pojuka.miatv.us/uploads/1/3/0/9/130968984/2587354.pdfIn PDF document text
    • http://files.pleasuresilb.com/uploads/1/3/1/8/131871698/tufixisu.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/ef6cc899-3fac-48b4-b341-17182b980022/zasovotadereg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e88561-f747-4d18-96af-b1e8814a41b5/55817324935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ec0d79-9a82-4946-9435-81594f1472a4/30169334078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f9dcfa-b81c-49fa-b0e9-8a59e594ba76/16611355379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6c55a6-0035-4948-9c5a-f7e3118ab2a1/kutabatagisufebediserere.pdfIn 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_off00005fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA6 5164 bytes
SHA-256: 59417281e4e412ee36d4ac50be0f2c7abd29fda289bbe8a054518e30c8212524
font_01_sfnt_off00007154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7154 11928 bytes
SHA-256: 08248eed5f3807599368286d5d86315f9c2705a7f38e47b0a37345eb15fb2e88

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