Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3ff01ddbb8699f…

MALICIOUS

PDF

79.0 KB Created: 2021-06-07 17:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 030c3babbf04e39d2db1781050bfe2ae SHA-1: 412a7682c7697cabc0e33805ab8b9402e61ec0e0 SHA-256: 8c3ff01ddbb8699f31fcc57b1c5c6a750bc30ebd3eb5b9285da27e6c2205e887
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one identified as a potential phishing or SEO spam URL. The document body is heavily obfuscated, but the presence of numerous external links suggests a tactic to redirect users to potentially harmful sites.

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://nomylo.ru/pbw?utm_term=main+jahan+rahoon+mp3+song+download+dj+youngster
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/4055b742d.pdf
    • https://nazafusi.weebly.com/uploads/1/3/5/2/135297870/335993.pdf
    • https://vifekifuveju.weebly.com/uploads/1/3/4/5/134597055/zadokomo.pdf
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/pixogamani.pdf
    • https://pawusavexamase.weebly.com/uploads/1/3/0/8/130813618/5981576.pdf
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/vowepatigil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39fdd300-a2a2-458a-a45e-5fc1e67d7ec6/91968502927.pdf
    • http://dumogaluz.pbworks.com/w/file/fetch/144606033/36961864529.pdf
    • https://uploads.strikinglycdn.com/files/e14a3974-12f4-4882-8d86-ec2fb90b3a6e/20_hp_mercury_outboard_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/b05b5439-52a4-4ffb-8cb2-658f467502e4/kugarogejese.pdf
    • http://nosiravuga.pbworks.com/w/file/fetch/144659880/how_to_start_laser_x_game.pdf
    • http://kimotamiju.pbworks.com/f/speaking_activities_esl_upper_intermediate.pdf
    • https://uploads.strikinglycdn.com/files/11509c06-3876-45b7-bf76-117e2b492e6a/64326502150.pdf
    • http://fatakalewene.pbworks.com/f/south_callaway_mokane_mo.pdf
    • http://botinuba.pbworks.com/f/gogikadamiporiwu.pdf
    • https://uploads.strikinglycdn.com/files/9bf46d0a-51c7-4e0d-8885-99a58df7fb99/xukogowasotogapesuvi.pdf
    • https://uploads.strikinglycdn.com/files/c070c577-8e17-4079-9e33-bf8be5c89388/ribimadimej.pdf
    • https://uploads.strikinglycdn.com/files/85a159bc-c1eb-48cd-9953-86a8dc3e77a9/69907867732.pdf
    • http://mutoteja.pbworks.com/f/soxajuwusugozopi.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_off0000ec37.bin
44a53421ed0a15eae2de1fc4ba8b147c5ffaab2fa53788b1632dc69f90490565		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 5812 bytes
font_01_sfnt_off0000fff3.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 1800 bytes
font_02_sfnt_off00010880.bin
7fbaad0b109522274f03636ae1cc763f62bfe4b301ac5e994708f46e48fbbffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10952 bytes

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