Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44f89f7ec7fa587…

MALICIOUS

PDF

128.2 KB Created: 2021-03-08 18:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 98a133ad40f553e6c20acd234fafcc6c SHA-1: 8076b8f05aa43ce37ceb22a1698769c1b08bff57 SHA-256: b44f89f7ec7fa587f5bfb79e2aa625ef214fad7e1c5428e15a0129f0c2fd732d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic indicate a likely attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dafemum.ru/award?keyword=jeremy+bentham+philosophy+pdf PDF link annotation
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/nijazikope_dedexena.pdfIn PDF document text
    • https://bulurumuz.weebly.com/uploads/1/3/1/1/131163623/digopojesek_zukoniluxipi_zaneseji_nexomaxujagor.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/kSghGBw/38464152492.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/jbohbhj/emergency_siren_ringtone_download.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/605dba2718.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/xMYjaCl/gs_race_skis_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/5M2ghA1/todeluzududisig.pdfIn PDF document text
    • https://cdn.sqhk.co/dipasupor/ajjjfje/78611891878.pdfIn PDF document text
    • https://jakineporop.weebly.com/uploads/1/3/5/3/135302356/280f6310f9c51.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/jeicShj/10597308084.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/d9e24cb.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/viranawiwob-limesur-dixewilawu.pdfIn PDF document text
    • https://cdn.sqhk.co/xurakipigub/Xejjgda/gusibajuvava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_d90f7a4922f445fcb1a1ced5f16ad6fb.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_e82dd8494045493badcf02661292a7a6.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_a5a19e28c86446b0b09989a7dcb25809.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_c92465c683b94d0b8b8a59fae003a7e1.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_4d83ed11d9c34670a2c929e4b5e78e91.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_off0001ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA79 5512 bytes
SHA-256: 26f2f68f6c76720b49e0c361a86db3345f0986268079c380a70a2f3295a5940c
font_01_sfnt_off0001cd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD08 11116 bytes
SHA-256: 810f9ae86c4d03cbab215fe8407c2293075d1366ff7854691e645944ac24cc30