Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56e564325721d74…

MALICIOUS

PDF

72.7 KB Created: 2021-03-31 04:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e9f47b8aec668264c4d1ad689239aa1 SHA-1: 5976f431ee06bc8e9dfdce6828936e1474455616 SHA-256: a56e564325721d74c3c4a8f4de81d8f05d75db9fe421ca3d27b7181c2d499856
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=the+psychology+of+winning+book+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/gapevusa/agemZgj/fishing_hook_tattoo_ideas.pdfIn PDF document text
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/zukawodogezum.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/dojowutakoti.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/hhhZig0/51068534806.pdfIn PDF document text
    • http://nozudozaki.22web.org/kinagenupokidogaj.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/4684d1240cd.pdfIn PDF document text
    • https://dotofopig.weebly.com/uploads/1/3/4/3/134307416/tuzotepoxizasowusij.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/pumajigemuze.pdfIn PDF document text
    • https://tarutugiwom.weebly.com/uploads/1/3/5/3/135326066/patita_bowaduru.pdfIn PDF document text
    • https://gepadagonuvo.weebly.com/uploads/1/3/0/7/130775626/5083ed4.pdfIn PDF document text
    • https://zurokexotuv.weebly.com/uploads/1/3/1/3/131384071/gesevumalusu-zadofalovuk-ruzufumaxawumat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xevupan.rf.gd/33395464616.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_32575a5fa129404a9ec047cfb77d6a77.pdf?index=trueIn PDF document text
    • http://seladetitogar.epizy.com/95044297594.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_03aadccc74984d08905984fefa0ca69a.pdf?index=trueIn PDF document text
    • http://reduwakofebej.epizy.com/mowazesudogevelepu.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_fa10258fdfbe4e62a4f18a29a3e82bca.pdf?index=trueIn PDF document text
    • http://moxurux.epizy.com/penaxunopixasoxafexulali.pdfIn PDF document text
    • http://nupopejif.epizy.com/2563652638.pdfIn PDF document text
    • http://dawutanarav.epizy.com/34953511686.pdfIn PDF document text
    • http://virefixifefuke.epizy.com/proportional_relationships_worksheet_answer_key.pdfIn PDF document text
    • http://banadefugavolar.epizy.com/vivorebuju.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_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 5764 bytes
SHA-256: dab015a9cb805107670a8ddf960df59514d66b130abd05bef88bfacec07bb7b3
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 10532 bytes
SHA-256: e2dd5a10306775f9c839a2fabeb35e04f33bc64f8d3dd52cc258e4dea713f6e3

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