Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1f384a2840aff5…

MALICIOUS

PDF

76.2 KB Created: 2021-03-13 17:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6a09756dc0778def7018fd97a93696af SHA-1: 00e3061bf80c5f653d41d0cf8075c2126f1cedda SHA-256: 4a1f384a2840aff596be87613dea3b3241cf74c8e0ff2ed45d7c7ebd9c06212c
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics as a malicious redirector and link farm, indicating its primary purpose is to lead users to external malicious sites. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the extensive list of embedded URLs, including known malicious redirectors, strongly suggests a phishing or malware distribution campaign.

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
  • 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/123?utm_term=volleyball+6-+2+rotation+sheet In PDF document text
    • http://madamzero.com/canine_neurological_examination_form4zai8.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/hidKibY/48021461215.pdfIn PDF document text
    • https://cdn.sqhk.co/xolizoxime/hc7mgjD/febijizaxaloxudozu.pdfIn PDF document text
    • http://azorocheat5.xyz/copperplate_calligraphy_free_download1znok.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/d9i0ucL/motuzazugisudamasuv.pdfIn PDF document text
    • http://theraisins.pro/29430221737y5k3s.pdfIn PDF document text
    • http://freds.space/chippewa_lake_ohio_fishing_reportbwi07.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/anxiety_workbook_cbt.pdfIn PDF document text
    • https://cdn.sqhk.co/bodujemep/fhViax0/88916472324.pdfIn PDF document text
    • http://opros.xyz/what_was_life_like_in_london_during_the_elizabethan_era46c37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_9e9f1a1de98d4eb48f6bdfe40840c3f1.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_8df6ea984cb647618ea18398f9a247e4.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_dc887c6d0a3340d6b6b9a9a3386c9856.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_3f978214dbf347d5a5fc03a26ce95678.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_d8563d08a34049e3a3dbea23a0e8cc2d.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_c1027e9295a742a3819db8c0e5a2fe29.pdf?index=trueIn PDF document text
    • http://japinoxizidunub.myartsonline.com/44589631738.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_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 5300 bytes
SHA-256: 9b78acd3ab7dfa6eab6a88ac216706b8b7100d7b3cf51117d2bd8e7b1c3d954d
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 11400 bytes
SHA-256: c32506f69230ca34fdf68a4475c66bc486fbda887044a10bad65ed67a111d4c6

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