Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23e701d4ff84cbc…

MALICIOUS

PDF

62.8 KB Created: 2020-12-15 09:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda478c49ee90c9dfe0742d5da01f141 SHA-1: ec74ab7d718eff85e6428fb0a306d16be31a3208 SHA-256: a23e701d4ff84cbce2091fff57702369e97b544ab43684450249bcbab659a9ed
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure itself facilitates the attack by hosting a large number of external links.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=xbox+one+controller+disassembly+ifixit
    • https://toxoxazagole.weebly.com/uploads/1/3/0/9/130969938/560c5f96.pdf
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/sutuje-gimupaze.pdf
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/4fde20248697d78.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kasibe-mibotuwesetoz.pdf
    • https://mojeleku.weebly.com/uploads/1/3/4/8/134862936/1156142.pdf
    • https://nebegixemavo.weebly.com/uploads/1/3/4/3/134359619/7776222.pdf
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/5517056.pdf
    • https://miwunukeje.weebly.com/uploads/1/3/4/5/134524605/pifelotewe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc3886edf132613bbce4a16/t/5fcca54f8a55f2188b732161/1607247184456/infection_rate_massachusetts.pdf
    • https://s3.amazonaws.com/wudibirewuduto/19690939535.pdf
    • https://uploads.strikinglycdn.com/files/fd6ce56b-9a6f-40c0-b95a-459d4924e0f2/35047305657.pdf
    • https://s3.amazonaws.com/tobojelusiwi/glass_rose_meaning.pdf
    • https://static1.squarespace.com/static/5fc185bea8793968640cb600/t/5fcf034614319a51dc27a1d5/1607402310509/dasimutixe.pdf
    • https://s3.amazonaws.com/bitajemisajoz/nachi_bearing_catalogue.pdf
    • https://s3.amazonaws.com/remeranexe/nuzubegivujive.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_off0000b7db.bin
e9be7b17330848d0041cb35a9296cb9d734ec2f53827d0a6b1da0ba2c8b06432		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DB 5452 bytes
font_01_sfnt_off0000ca57.bin
6771955d93ea8431ddf8d96b9896f633c7a483a88be72e8bf5a5cb7a268d2468		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 10476 bytes

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