Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cde736cdd9270a…

MALICIOUS

PDF

75.2 KB Created: 2020-11-17 07:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 580124fa5117d06a60f3411c59868288 SHA-1: 1fa7db3e23a9ff3b9ed3bd7bdd34d29ec261b2c6 SHA-256: 82cde736cdd9270a81fcd1e126066fb7b2aa09b975449239d6446ed1359a8c84
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a phishing or SEO spamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffking.ru/123?utm_term=voice+attack+manual
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/d61fb1165acf1f5.pdf
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/nuxidodirag_vunoko.pdf
    • https://bujugerevik.weebly.com/uploads/1/3/4/6/134677448/6622385.pdf
    • https://zotadipijipas.weebly.com/uploads/1/3/4/4/134467791/1029375.pdf
    • https://zirasave.weebly.com/uploads/1/3/4/0/134096010/cf665.pdf
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/kekizazuzogisive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/601e39a6-9d37-4497-8063-8624eb354a77/76071479176.pdf
    • https://s3.amazonaws.com/vutame/epf_kyc_update_form.pdf
    • https://s3.amazonaws.com/potevip/ralipiralizolutimez.pdf
    • https://s3.amazonaws.com/jozetej/77090264008.pdf
    • https://uploads.strikinglycdn.com/files/de006e02-c7b6-413a-9274-4e56f005acc3/fibawubopaduxebuzulirozuv.pdf
    • https://s3.amazonaws.com/ligole/josonewofonugotav.pdf
    • https://s3.amazonaws.com/megulu/apple_bloom_cutie_marks_meaning.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_off0000dec1.bin
f1824efe55518efd87a149dc09148562a52cd06a75d22b82f548a1fc455bc9df
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 4584 bytes
font_01_sfnt_off0000ee38.bin
f9ee42ee7fd94ecfa52794a6d0b89319153549ec1fd91173360e66f5c4333222
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10408 bytes
font_02_sfnt_off000111b7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 4324 bytes