Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f5765a05b5fdd0…

MALICIOUS

PDF

108.3 KB Created: 2021-03-25 04:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1ab3d1736661f229a4842f612f1459c7 SHA-1: b2133fe677c521fcf02c5e243d60939d94c77648 SHA-256: 77f5765a05b5fdd0b6e9091afd12273039f5572531db3a8b6336fd49db593635
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to search terms like 'Dell optiplex 760 diagnostic lights', implying a lure to trick users into clicking on the embedded malicious URLs.

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
  • 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://soxebez.ru/strik?utm_term=dell+optiplex+760+diagnostic+lights+1+and+4 PDF link annotation
    • https://vujugorakiti.weebly.com/uploads/1/3/4/7/134719441/8068035.pdfIn PDF document text
    • http://4338bacchus.com/24968530863j9mq.pdfIn PDF document text
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/tibifodebom.pdfIn PDF document text
    • http://wildber.store/207018557126bue1.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/camera_scanner_to_kndigen.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/197accdea.pdfIn PDF document text
    • http://vijoviresole.mywebcommunity.org/gufavosilaw.pdfIn PDF document text
    • http://gidpopiteru.com/99047009943nwjug.pdfIn PDF document text
    • http://boevoenlp.com/depuxofirimetegipovexjme2h.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/gikilupoxutin.pdfIn PDF document text
    • http://kurs1.xyz/resumen_del_libro_el_reino_de_este_mundo_por_capitulos383mm.pdfIn PDF document text
    • https://jowetetezuvam.weebly.com/uploads/1/3/4/7/134717416/8059144.pdfIn PDF document text
    • https://fixizogi.weebly.com/uploads/1/3/5/9/135959929/2478bdc55.pdfIn PDF document text
    • http://brettlockhart.com/hojas_de_ruta_jorge_bucay8nyze.pdfIn PDF document text
    • http://livethailand.fun/viripedaganozewpm9zo.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/6422776.pdfIn PDF document text
    • https://duwelivupegated.weebly.com/uploads/1/3/4/7/134711348/a9afc8c0873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_f91a6c9595da432d88301fa812c385f2.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_60ec44d6cd064e9bb0518a63fd2f64df.pdf?index=trueIn PDF document text
    • http://tobikinos.onlinewebshop.net/how_to_pair_xr2_remote_to_sony_tv.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/bolsa_de_valores_definicion.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_9a7a1f82fa964700aa3287dd93685e44.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_10819ad1a4fd4d40b8f447bd4d97d118.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_off000166a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A9 5824 bytes
SHA-256: 357bcd71ad43df5951eeeae427a4deddfbaf3f436dae5ed9b73fc2a72be159de
font_01_sfnt_off00017a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A98 11576 bytes
SHA-256: b76e65478fa61b520285cbe4ff45a8f4eb91c9bd07f608df82d83809f4f238f4