Malicious PDF — malware analysis report

Static analysis result for SHA-256 761a8b0085de5dda…

MALICIOUS

PDF

77.5 KB Created: 2021-06-01 11:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 49ba56979fffabbf8002a72b4024411b SHA-1: 7b5d199465c0856ae2ea7283a65d3d9be3f9f77d SHA-256: 761a8b0085de5ddaacc847640e27598d5b60b5e127a290a88c1cd9746ff05c45
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or deceptive content, likely for phishing or ad-fraud.

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://inwebjor.ru/pbw?utm_term=how+to+structure+a+tribute+speech PDF link annotation
    • https://tusubolamofe.weebly.com/uploads/1/3/5/3/135322079/6759029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_6063523376580.pdfIn PDF document text
    • https://wubixuduliku.weebly.com/uploads/1/3/4/4/134466255/7920976.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/zobeba-wufijodexotime-dafezememebo.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/1688151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5ff0488d78261.pdfIn PDF document text
    • https://tipezigixak.weebly.com/uploads/1/3/4/3/134339593/renatewokikol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_603bc7307e8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_602830c00c1f1.pdfIn PDF document text
    • https://boxakowomer.weebly.com/uploads/1/3/0/8/130874011/bifagete.pdfIn PDF document text
    • https://xoluvujotu.weebly.com/uploads/1/3/1/0/131070376/2172642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_5ff505d625550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_603c00b38a75d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144435429/27096386903.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/72246202453.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416133/gexanefodolotidise.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/athulitha_baladama_hanuman_chalisa_lyrics_telugu.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/what_are_the_9_circles_of_hell_in_dantes_inferno.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144446715/how_to_install_dlc_gta_v_ps3.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/creature_3d_movie_songs_mp3_free_download.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_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 5184 bytes
SHA-256: c8fb82a4d441c06a2909e8d3dc3f0973db8fa88865e2d03f1ef8ffd821de28f9
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 10148 bytes
SHA-256: 27249c0147d314f3bce0702e563942b5279631dca90dd19b45413785c5398345