Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8647b20c29728f7…

MALICIOUS

PDF

73.8 KB Created: 2020-11-17 15:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ffa0845580afcd999ee55183e880ea2 SHA-1: 118671b38e7578c449d58c04e66799a88503f10b SHA-256: a8647b20c29728f7840b886dc5cf0c050ad9efb7ec376c71b9ce50eeb4635a47
214 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector at `https://traffmen.ru/aws?utm_term=updated+asthma+guidelines+2019`. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'updated asthma guidelines 2019', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/aws?utm_term=updated+asthma+guidelines+2019
    • https://cdn-cms.f-static.net/uploads/4423443/normal_5fae027294001.pdf
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5fa98444ab6bf.pdf
    • https://cdn-cms.f-static.net/uploads/4446045/normal_5fa7a1374caf8.pdf
    • https://gogekelonirivi.weebly.com/uploads/1/3/4/4/134438841/722693.pdf
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f89cb41dcfbb.pdf
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f8ad6f6e36e3.pdf
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/9461a.pdf
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f91884e34032.pdf
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/03042.pdf
    • https://cdn-cms.f-static.net/uploads/4446645/normal_5faef63e3d991.pdf
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8742531a26a.pdf
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f8ba98994493.pdf
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f920f64df122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/ecac6988-ed9b-4a3e-9c93-3b2697ec3786/lulone.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d354.bin
6e80fff701d2202c9366cd2e93f53e058f13fd065407c8b56e7f674c771ea0d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 5752 bytes
font_01_sfnt_off0000e6b9.bin
7a02da73c5ff24218d04b188db7d31ceb9303d5dedd43b645f18a615a19d9b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 6068 bytes
font_02_sfnt_off0000f66a.bin
661a7d4ec2a2cf4952dffe16709f959cad001f69a7f287cdb29adfc8a462d18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10516 bytes

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