Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b45d614bb47435…

MALICIOUS

PDF

77.4 KB Created: 2021-05-14 00:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aea3b7446a21569fc413db918dd96f39 SHA-1: 9f7cdaa191d5e4083355c1cbdd29b92846bbca24 SHA-256: e0b45d614bb47435de617e1160c54df902cd122c4f9ee4e253bfab1991604ac5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a phishing trojan and contains a large farm of external PDF links. One of the embedded URLs, https://lozipotod.ru/strik?utm_term=the+skin+i%2527m+in+chapter+13+summary, is flagged as unknown reputation, suggesting a potential malicious redirection. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, potentially for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://lozipotod.ru/strik?utm_term=the+skin+i%2527m+in+chapter+13+summary
    • http://sibuvre.com/mavigamegoxawowidowowusap4od7.pdf
    • http://opensalle.xyz/38512080503g8j1l.pdf
    • http://neo-tp.ru/rajojunezetikenefqjoo1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_5a367d2c73ca4723a80c274d6d668bc6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf8ad41e-3c26-4192-a207-2de911fb8367/xojakalozafuxukojakarep.pdf
    • https://s3.amazonaws.com/davawina/puseveni.pdf
    • https://s3.amazonaws.com/mubefula/juvuximikegekafo.pdf
    • https://uploads.strikinglycdn.com/files/15d8f50c-6818-4069-9492-22af887f673d/zuzuxuvexatupa.pdf
    • https://uploads.strikinglycdn.com/files/b05580a1-884f-4fab-a55c-f7a1cd2c34c0/you_do_meaning_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/a2a573ff-9f35-43f8-95f8-7c44ba82f5b5/brother_hl-2170w_wireless_setup_mac.pdf
    • https://uploads.strikinglycdn.com/files/353958f1-0bee-4287-a9f2-4afdd3739973/42277261790.pdf
    • https://uploads.strikinglycdn.com/files/c05a0c01-9818-4067-b3bb-1637404945df/58097736090.pdf
    • https://s3.amazonaws.com/rufonali/rurazurutiru.pdf
    • https://uploads.strikinglycdn.com/files/8afe00f1-f3e4-4cb9-b763-e301e0068eb8/vulifejukonedo.pdf
    • https://uploads.strikinglycdn.com/files/cdd2d2cf-84d9-4173-936b-2e420159737d/construction_quality_management_plan.pdf
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_287639ef26c74c53bb7dae5eae3dd502.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d57cf942-b23e-4243-b935-0fd5ce743ae3/fuziwejonobivo.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_off0000e4d6.bin
b41ff4f2b69ddf71500f010130697fb64f3748f4151710ca57cfafda7794d3af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 5280 bytes
font_01_sfnt_off0000f6a0.bin
1d6eea022bf7599823dae8328d3efb20e17f026daae856f069307b6db8e11063		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10480 bytes
font_02_sfnt_off00011a95.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 4324 bytes

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