Malicious PDF — malware analysis report

Static analysis result for SHA-256 3716895b0d43299c…

MALICIOUS

PDF

88.1 KB Created: 2021-03-23 09:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 225b999eca76efa6cd5dbf07956f9c02 SHA-1: 348d95a95c9675d492b9bc4a411f9351a08d822f SHA-256: 3716895b0d43299ca8b100ce4d243a9a384f338078fe55858ab2bd00dcf60245
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, forming a link farm. The primary URL suggests a lure related to a movie search, likely to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with 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
  • 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://nipisod.ru/strik?utm_term=20000+leagues+under+the+sea+full+movie+1954+online PDF link annotation
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/29923670107.pdfIn PDF document text
    • http://pubofumoxo.scienceontheweb.net/birkat_hamazon_reform.pdfIn PDF document text
    • https://vuzodafolo.weebly.com/uploads/1/3/4/7/134732359/jugewulumovodeson.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/eoiaIhb/mibuvimavet.pdfIn PDF document text
    • https://cdn.sqhk.co/wevemugas/b4Lidgg/how_to_use_rap_beats_apple_music.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/WrzQhbL/free_math_learning_games_for_first_graders.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490738/normal_6026ba3ff20e1.pdfIn PDF document text
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/kixosawufowulevonuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5fdc0936cd368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fdecb3343a81.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/79hbLgd/muzigorivuzulavurof.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/fusionner_deux_en_un_seul.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/dZJASgg/local_bars_maui.pdfIn PDF document text
    • https://mojapilujo.weebly.com/uploads/1/3/0/9/130969316/xegaru_mumovuxu_xifojim_nasotem.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/hhi5E4d/24148291418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ff864b4e2711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5ffcac22ce4fc.pdfIn PDF document text
    • https://kulegireketo.weebly.com/uploads/1/3/5/3/135325025/fupeju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zulolabopel.myartsonline.com/understandings_of_ideologies_textbook.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_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 5980 bytes
SHA-256: 797414b0646660c3c9029915a7a2a43320083050ae0b059a8f956429ee0f3c20
font_01_sfnt_off00012e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5E 10728 bytes
SHA-256: 3bbb63a9c5f7a648a0513bd2272453806f76fb73482236b428cbb9dbf8ba7014

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