Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb64565ce0ba9ff5…

MALICIOUS

PDF

66.8 KB Created: 2021-01-27 04:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c7767cdd04ae87896cf82ea9fe533a0 SHA-1: c73e8458b238da1e72bc0085d727eb1ff47088a0 SHA-256: cb64565ce0ba9ff50d843de74109ac2b8bfed5bc7db6e0e14c99202992d26521
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/aws?utm_term=lagu+cinta+luar+biasa+cover+felix In PDF document text
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5ff2876519871.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/4792756.pdfIn PDF document text
    • https://zuxaminuxux.weebly.com/uploads/1/3/4/6/134652083/4957398.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/inkredible_handwriting_note_apkn8rxe.pdfIn PDF document text
    • http://g00y.xyz/tomanozokajilafusigonadkx07o.pdfIn PDF document text
    • http://dresdenpharma.ru/crowds_and_power_elias_canettifow7s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_5fdc799fa567a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_60003674de5bd.pdfIn PDF document text
    • http://adminhalil.com/crystal_report_server_20085i9yi.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/mageleguxoro.pdfIn PDF document text
    • http://blog-millionaire.buzz/regal_academy_fairy_tale_pop_20hobh.pdfIn PDF document text
    • http://portkamesto.site/boku_boku_lyricsadxt9.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/a556b9a7.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/gOji0iT/58462544810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 5260 bytes
SHA-256: f8c63273a195be953caf0df65054000eb36e62501dd480b242465ecb96ff4f5a
font_01_sfnt_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 10468 bytes
SHA-256: 4f894c31e3e50cf29912cad56ce7caa5e429721e2ddb28be838d014d7b46b4f1

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