Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb9b28347b6d21b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 06:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 301e152dbe60b33f4dad1e2310df9acb SHA-1: 5594e8832f68636af57c980fca5198b07cee08f0 SHA-256: adb9b28347b6d21b6720bd2b78c1584da777aa5950d1c3918d76f00e0e9587aa
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ML classifier and ClamAV detection, indicating malicious intent. The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO poisoning tactic. One of the primary external URIs, 'https://vilenefex.ru/award?keyword=ashby+and+jones+engineering+materials+2+pdf', is suspicious and likely leads to a phishing or malware distribution page. The presence of embedded JavaScript, though not fully detailed, further supports the possibility of malicious actions being initiated from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/award?keyword=ashby+and+jones+engineering+materials+2+pdf
    • https://cdn-cms.f-static.net/uploads/4469836/normal_5fd1341736aef.pdf
    • https://luwuberukad.weebly.com/uploads/1/3/1/4/131409546/ac552c96cbf48e.pdf
    • https://cdn.sqhk.co/lejesapazud/igtVYOL/wewoju.pdf
    • https://cdn.sqhk.co/wupifufexix/hcjgEih/lezorevakomi.pdf
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/5dcbfb2e17d2d3.pdf
    • https://cdn-cms.f-static.net/uploads/4428033/normal_603faec5640f5.pdf
    • http://falorilipeb.mywebcommunity.org/bajulipajumugo.pdf
    • https://cdn.sqhk.co/moturira/hfhciiD/dictionary_python_get_all_values.pdf
    • https://cdn-cms.f-static.net/uploads/4491439/normal_602510b8b415d.pdf
    • https://cdn.sqhk.co/lekusovu/jPnogcC/fafimiputelenusisera.pdf
    • http://fanisore.sportsontheweb.net/19740519379.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_75fef6bbbfc0453fa7d107788a2725f2.pdf?index=true
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_724661a300744a7bbdbd4c503c37fb75.pdf?index=true
    • http://bebovufuvuji.myartsonline.com/vopupeberosilenatetesiru.pdf
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_f89a073ec68e44e791e105b640b83889.pdf?index=true
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_aeba1a96ac1c47069f9cd616c4518fc4.pdf?index=true
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_705ad64909264a35830229cb009d12db.pdf?index=true
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_2685ec0ba48945fba0791141191e8d1b.pdf?index=true
    • http://dowuvoduwitovos.atwebpages.com/dudutulavu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddae.bin
2ff5ca96dd07e6aa545a1666f2ed4108d83dc5e357a2b068766f27294b4888e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 5684 bytes
font_01_sfnt_off0000f0d6.bin
2a8f20afdd0806b8de5d2d27b1425f63355917836f87df694be84589d1c5563a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10656 bytes
font_02_sfnt_off00011552.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 4324 bytes

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