Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a7069af04c0a91…

MALICIOUS

PDF

90.7 KB Created: 2021-01-06 07:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3ab7683598c654312ff8d8dd5a91077b SHA-1: 37d3903156b2a973c4e8c77e875cc0888f9947e5 SHA-256: 61a7069af04c0a91be654dce20de8fd43edf7e3b9cc5f5a199204959745dec94
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One critical heuristic indicates that a link points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/aws?utm_term=autocad+lt+2012+testversion In PDF document text
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/5d126c7630.pdfIn PDF document text
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/9023588.pdfIn PDF document text
    • https://sovawetozinunur.weebly.com/uploads/1/3/1/4/131407226/jezuzusodabega_desukozowagu_tevupubivi.pdfIn PDF document text
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/xofogategogule.pdfIn PDF document text
    • https://lodufowuk.weebly.com/uploads/1/3/4/5/134593986/wefotowatoga_nubepodazagano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fc95da55914e.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/jFAjigc/inside_out_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/Viegigc/xupakemiluxotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5fc0f5af781ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f9af8f396108.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/8870755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f8bfa287f3ae.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/df127798-e4d3-4df4-9193-1427dec4d877/queima_gordura_concentrado_plus_de_a.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012e57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E57 26084 bytes
SHA-256: 5d8d60b41500c02560637affc82e53507e30532df0dad37d95a00d9128f74c4e
font_00_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 3492 bytes
SHA-256: fc595548ce9389a3702c6d46a8339e8539963b1a7a3236015fffb5e3b61ee635
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 5308 bytes
SHA-256: 43c206999b1a89e87de3834f7ecb9db43c8bec3dd2eaecbfdd6efe3085a14ff7
font_02_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 12776 bytes
SHA-256: 61d98872a428dcfc3719ba5c60868b48d9e2f29727c16e2273d2040e8b502f41

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