Malicious PDF — malware analysis report

Static analysis result for SHA-256 870027f30b26f292…

MALICIOUS

PDF

75.7 KB Created: 2020-11-18 05:25:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 648f3d5ea3a9ab332beefbc314d69f39 SHA-1: e81abe4a909dfe0b3be5698020eb49cba3ad53a5 SHA-256: 870027f30b26f2929ea12f7e0a6d27a2c0b6db3b9b731c437fd8aa2e993907e2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of directing users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this document, likely used as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=choose+your+own+adventure+app+android
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/55a7b.pdf
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fb3e51d68623.pdf
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5fb46ed0f165a.pdf
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/sasoma-bororenimomo-zalasetegudafe.pdf
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f871e7bed5c3.pdf
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5fa94ec3ac685.pdf
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/8511581.pdf
    • https://cdn-cms.f-static.net/uploads/4420434/normal_5fa26da2da885.pdf
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5f9072d2aa323.pdf
    • https://cdn-cms.f-static.net/uploads/4465688/normal_5fadc0d12b307.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/6887914.pdf
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5f93fcab8ec16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2ebbaedf-354d-4244-9d7f-752bebd850a6/61832226385.pdf
    • https://uploads.strikinglycdn.com/files/417b9e85-dd51-40fa-aa76-2094079daa6e/34889949623.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_off0000ddee.bin
c88f2d4c4c69966fc011536fd9ca37e9b968aa051a8ffec870be6a2d89835d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 5176 bytes
font_01_sfnt_off0000efa0.bin
5efcf2194e9e7b70c2d4340227dc876f4b7d58151f01afccc05a717ae18a8699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10552 bytes
font_02_sfnt_off0001139a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 4324 bytes

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