Malicious PDF — malware analysis report

Static analysis result for SHA-256 52af461c409fdb87…

MALICIOUS

PDF

125.1 KB Created: 2021-06-10 04:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d062d2e06048e9dbc1258b50c88336bc SHA-1: a90429f7a90de5de794473d2c531ddead36a8499 SHA-256: 52af461c409fdb87544209d04b1feb3cda01662153b5a38cd92906255aab8fd2
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or SEO spam campaign. It contains a large number of external links, many hosted on disposable domains, pointing to a link farm. The document body, though heavily obfuscated, suggests a lure related to 'intelligent animals' to entice clicks on these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://inwebjor.ru/pbw?utm_term=top+5+intelligent+animals PDF link annotation
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/3a47586de6fe6f7.pdfIn PDF document text
    • https://silixumofabu.weebly.com/uploads/1/3/2/7/132712413/zewagesu_xazikinusus_mewetagono.pdfIn PDF document text
    • https://nodekisoguzila.weebly.com/uploads/1/3/5/3/135313862/koxali_moligefigabi_lirovivijatefuf_nijorekaxufome.pdfIn PDF document text
    • https://zajanitemamivow.weebly.com/uploads/1/3/2/3/132303208/zudepuza.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/buvolomuvimavap.pdfIn PDF document text
    • https://jizawabule.weebly.com/uploads/1/3/5/9/135966138/fifivixiboru_bepobuloresul_dokasekozifikap_kenoxa.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/7009249.pdfIn PDF document text
    • https://gadikidaju.weebly.com/uploads/1/3/1/3/131379663/wafovikewetosiluxit.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/7545299.pdfIn PDF document text
    • https://surarapumo.weebly.com/uploads/1/3/4/3/134305151/nomigigelumufemipi.pdfIn PDF document text
    • https://davugewozo.weebly.com/uploads/1/3/1/4/131408984/rozul-wiwudegew.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/wakodinatuvagepiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/114d9263-e657-46cf-80e8-dc574104dbb6/35190831970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3811681-692d-4be6-9a36-9f469ddf2bf2/4207236543.pdfIn 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_off0001afc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFC7 5116 bytes
SHA-256: f91995671d6193b4d39bd6f4bfea3f32758ec006fd7d5240bcf9f1ac5478c91c
font_01_sfnt_off0001c126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C126 11228 bytes
SHA-256: 36d89fa9240d06f51a989be20225d54ba8aace1e747a2165e44adcccc5df90be

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