Malicious PDF — malware analysis report

Static analysis result for SHA-256 0150eb87ac839d6c…

MALICIOUS

PDF

83.6 KB Created: 2021-03-18 23:25:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ac261eb88b479d04fe3c6579496ba70d SHA-1: 13d13e8788bf21fee2ccff0144db8b3c7b025b57 SHA-256: 0150eb87ac839d6c1ede6b9f8cad6c4dbd13c4fe3acfd0ab2f2ea3d93ef7d01f
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity.

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://bologen.ru/award?keyword=bsf+pay+slip+pdf PDF link annotation
    • http://bokadexediwax.22web.org/realistic_colour_pencil_drawing_tutorial.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/loxub.pdfIn PDF document text
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/vevuxolobuva.pdfIn PDF document text
    • http://all-casino.xyz/arduino_uno_r3_schematic_kicadp43or.pdfIn PDF document text
    • https://tevadurut.weebly.com/uploads/1/3/2/6/132682826/2738398.pdfIn PDF document text
    • http://ziwumununazofal.iblogger.org/tonuvasijoti.pdfIn PDF document text
    • http://degitowexara.iblogger.org/81016198672.pdfIn PDF document text
    • http://damita.fun/why_is_my_whirlpool_refrigerator_water_not_coldd154h.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/kezavizesub-jagizizos.pdfIn PDF document text
    • http://mosuxemapawezi.iblogger.org/60635864916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_ac9180bc9f60467499450f2863cae7d2.pdf?index=trueIn PDF document text
    • http://tereralubo.epizy.com/84355236337.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_a628b8c21039428fb3a5093af6bb52b6.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_740b53897d7e4a8895ea0e2679c2a40c.pdf?index=trueIn PDF document text
    • http://pikejip.rf.gd/asbaq_e_tareekh_free_download.pdfIn PDF document text
    • http://tumofif.rf.gd/ordinary_level_mathematics_notes.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_2501302ca760441897bc3ee9e72b4aec.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_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 5088 bytes
SHA-256: e27ae33546d6eaa4ba058202d3f563359767f999b16d289a62cc4dadb0812faa
font_01_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 11156 bytes
SHA-256: f68057ee20b821ff3e334da474215b736ff265d3ff9ad9fe411e99be4b81aa24

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