Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f854cce1733c6b…

MALICIOUS

PDF

71.4 KB Created: 2021-02-19 21:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: af8ec6b0cf877903747ad4e7240b50c1 SHA-1: 515c44b6298bf6d3171476fb18fec217d046279b SHA-256: f3f854cce1733c6b09b6e017ebd23dd18229988dd92f502a2d7fc3faaa3850a8
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristic detections indicating it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, disguised as a rental application fee payment. No scripts were extracted, but the presence of multiple external URIs points to a redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=rental+application+fee+california PDF link annotation
    • https://raxipova.weebly.com/uploads/1/3/4/2/134234678/1855555.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/hdiejjk/black_and_yellow_iphone_wallpaper_hd.pdfIn PDF document text
    • https://nesojikav.weebly.com/uploads/1/3/1/3/131398336/winadijamaku_semesov_xidam.pdfIn PDF document text
    • https://jifonoru.weebly.com/uploads/1/3/5/3/135316211/fujikenofutoxiro.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/hheidXD/verawopuzesokuja.pdfIn PDF document text
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/pixejojex_jedesesetap_xowimofakix.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/juvezaxas_pumibiwoloz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fawipiro.rf.gd/60059513067.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/3735581080.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/98205303280.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/xamarin_android_action_bar_tutorial.pdfIn PDF document text
    • http://momesesewoja.rf.gd/new_movies_2019_bollywood_comedy.pdfIn PDF document text
    • http://pinogizege.rf.gd/34397272687.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 4840 bytes
SHA-256: 8e5f7581fe9d1f21be03f70022bc5e9ae76fbd31e2a39befde666bb04d0b9263
font_01_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 10704 bytes
SHA-256: 9a5c94f5d901958ebd582b8327f2a968403c530ff46448cccb7ae0b8e9640a42

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