Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3d952ca4c1a989…

MALICIOUS

PDF

70.6 KB Created: 2021-01-07 21:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47479ea4ac950fdfeeea7496a2a54d30 SHA-1: bce1b6db77731a07d0341e241f1866031755b8f0 SHA-256: 7e3d952ca4c1a989c2bcdcd9a32d4e993758c975b5fcbcfb72b0696d2fc6f310
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier also returned a high confidence score for maliciousness.

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
  • 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://trafffi.ru/aws?utm_term=cadets+uniform+buy
    • https://cdn.sqhk.co/xonivozew/jahiwgg/cdc_solve_the_outbreak_worksheet.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/fawugafegawibogawu.pdf
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/nugikadu.pdf
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/ritupi.pdf
    • https://kulilopoxi.weebly.com/uploads/1/3/4/3/134375859/lubupuvedegam.pdf
    • https://cdn.sqhk.co/firijanab/hF5BjhN/53466487404.pdf
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/xefewuz-malolazodokorob-nexizojisemon.pdf
    • https://zidevikab.weebly.com/uploads/1/3/4/5/134576262/sivemisigefoz.pdf
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/gurujajerese-lujube-mojojo.pdf
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/nifivapozotetiri.pdf
    • https://nudezodubazez.weebly.com/uploads/1/3/1/1/131164524/2062c97f.pdf
    • https://rixuxakixolewe.weebly.com/uploads/1/3/1/3/131380342/tefube.pdf
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/semafuw_mavikodutuju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8d187b3f-b277-48ee-a20e-a9017b0e0113/bivobejilaba.pdf
    • https://uploads.strikinglycdn.com/files/bac45b77-97ad-466e-9b8d-ecd69c875e63/60042139905.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e6.bin
1e07897bee319528fcb701d024c0cddf9c2b37848e3c4ff78953e3ba51edcc72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 5168 bytes
font_01_sfnt_off0000e867.bin
c8df75123a0ed507798a16cd37b5b39783cd24dc66c3a78f9cef9caefe6a3ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10460 bytes

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