Malicious PDF — malware analysis report

Static analysis result for SHA-256 1439d1533d5a2c32…

MALICIOUS

PDF

70.5 KB Created: 2021-02-06 13:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 23ddd5475bde9e36945ff46f0721bb1f SHA-1: 6d661dc37b8586c92c533eeea6477db1b78fd760 SHA-256: 1439d1533d5a2c323d5187c15c2494196e77a37cd10f1311bd414802ce090feb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest it may be used to redirect users to phishing sites or download further malicious payloads.

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://maypoin.ru/aws?utm_term=darkness+rises+android+release+date PDF link annotation
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/lalapewajuse_kejip_giwifo_wariv.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/nutur_penogoxad.pdfIn PDF document text
    • https://surutadalonuta.weebly.com/uploads/1/3/1/4/131455158/fasidokokerazezuva.pdfIn PDF document text
    • https://gozaperirij.weebly.com/uploads/1/3/1/1/131163841/2046513.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/lajes-kumujalojosof-kusemogir.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/1514826.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/8c04ffb.pdfIn PDF document text
    • http://reduslim-italy.site/zufumadagagenejyvy96.pdfIn PDF document text
    • http://experiment.website/739825863179abk2.pdfIn PDF document text
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/3eaf46ef6ca3b7.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/renibumatele.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/49277806205bz8gw.pdfIn PDF document text
    • http://idealica-italiauficiale.website/pupebemufozomeyaaai.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/55c90e122.pdfIn PDF document text
    • https://lelodudovoveju.weebly.com/uploads/1/3/1/6/131607117/57dfdc.pdfIn PDF document text
    • https://xevomixu.weebly.com/uploads/1/3/0/7/130776485/304cdd55b9837d.pdfIn PDF document text
    • http://mazers.fun/95447842226b9cp0.pdfIn PDF document text
    • http://korecos.ru/cervical_rib_exerciseszlqlz.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_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 4884 bytes
SHA-256: 203f3b71213f51ae173ca27c4c884e6d7ac873bd2c65dda9d6e744a5783ace22
font_01_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 10100 bytes
SHA-256: 165f803086097e6c0b4f87cc29e1bc8ae1a18fe2e9552626261e3f4eb4ae0f30

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