Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dd4fadcd163fb1…

MALICIOUS

PDF

71.2 KB Created: 2021-02-23 15:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4ffc6ccfbc4fcbb02eb8fb4bd7360ea0 SHA-1: d76b256750089621d935ced52110fe6366df478e SHA-256: b1dd4fadcd163fb1828972b5d530f1ca24b411fb8438bc5c8586df3bc13550a8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection confirm its malicious nature. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Old yeller dog pics', which is then used to redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=old+yeller+dog+pics PDF link annotation
    • http://rat-red.space/zobanilapuborsxr49.pdfIn PDF document text
    • http://vorecan.fun/61394345404g2y7d.pdfIn PDF document text
    • https://zusifupovososix.weebly.com/uploads/1/3/2/6/132680896/bemejasizib.pdfIn PDF document text
    • http://parrrtner.xyz/christian_d_larson_i_promise_myselfpsa74.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/salirofizuga.pdfIn PDF document text
    • http://namedaun.fun/bulitomowumobagikepult9unm.pdfIn PDF document text
    • http://fb-ig-copyright.com/nezijugenilifamajisevokozh1d7n.pdfIn PDF document text
    • http://guwejusu.22web.org/petit_biscuit_sunset_lover_free.pdfIn PDF document text
    • https://dujapiloxi.weebly.com/uploads/1/3/1/8/131857305/4131414.pdfIn PDF document text
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/c2de5f4e.pdfIn PDF document text
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/9645237.pdfIn PDF document text
    • http://xekuluw.iblogger.org/audacity_app_per_android.pdfIn PDF document text
    • http://afracheat9.xyz/35822708141pm7ky.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwazepomigu.epizy.com/honeywell_chronotherm_iii_wiring.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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 5160 bytes
SHA-256: bcabe2811ab36c8fcfd746071d0e65974ceeea9c5fadc3e1e1b4ecfdb7b36763
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 10820 bytes
SHA-256: 67d325797049667fb8774a162667c86ceb1617bdc2ad361bf023891788aa6f1b

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