Malicious PDF — malware analysis report

Static analysis result for SHA-256 14be0483b7a9c6b0…

MALICIOUS

PDF

97.1 KB Created: 2021-02-19 16:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c77203cca91380b7626952b06e8ae572 SHA-1: fa009c7191553bbbfa2640aa1babddfadee0b139 SHA-256: 14be0483b7a9c6b0b44eac2c71a50f5f9da3293a0753f089c4362141e47ba0e6
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or redirection to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=interior+design+schools+in+canada+for+international+students PDF link annotation
    • https://cdn.sqhk.co/zamodozitip/ChhN5sP/48650997524.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/fd1130afb26e37.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/jjiheF0/93903715678.pdfIn PDF document text
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/3139803.pdfIn PDF document text
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/wanomanox_bojizuximopin.pdfIn PDF document text
    • https://julureka.weebly.com/uploads/1/3/5/9/135957187/veluw-zipuzunegijopa-gitiwimezepa.pdfIn PDF document text
    • https://romubavopu.weebly.com/uploads/1/3/4/8/134884942/jexite-dobiwokulabo-lefeje-pimere.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/7731115.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/i1jdFhg/67888497044.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/vidadiga_gixoziteban.pdfIn PDF document text
    • https://tixuxawopor.weebly.com/uploads/1/3/0/7/130738504/42cbf837c1d44b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nurupejizijij.rf.gd/personal_immunization_record_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/55844664508.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_off00013f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9A 5220 bytes
SHA-256: 6c39343c71d982c0b1d378e25f85b9451a629804f4429f7d6743a485b08a5477
font_01_sfnt_off00015158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15158 11236 bytes
SHA-256: 6dedb0117fd87bacd45fe60512e79d688141090e9a05660624c006c04f42a3ec

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