Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84ce71508550b52…

MALICIOUS

PDF

77.2 KB Created: 2021-03-19 18:24:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9074ce7797a110413eec3b56cce88264 SHA-1: 5191324dceae9a7c688e93bd96d48009eed63134 SHA-256: d84ce71508550b52f6fa14b81ad2e77ce2f56701d254b7932ca89a6f79b069a0
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 0.9998

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://leonvi.ru/123?utm_term=checklist+format+for+road+construction PDF link annotation
    • https://cdn.sqhk.co/dasotipamu/Siajbjg/93701283709.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/8wchDie/zimijodajuvuvibijewu.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/jjqghRZ/revexasotalirit.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/gJsggjg/gevezovesagixubero.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/d9ijjfF/24466253059.pdfIn PDF document text
    • https://cdn.sqhk.co/mivezifov/jiggRcq/dedebonulawerek.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/oeiiZij/alarm_sound_mp3_ringtone_download.pdfIn PDF document text
    • https://demuvejujewik.weebly.com/uploads/1/3/4/0/134042515/d16c31d57b06c.pdfIn PDF document text
    • https://xagatozemeladab.weebly.com/uploads/1/3/1/4/131406701/rileseza.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/fgi08Pe/kibakonin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rerinago/sahi_bukhari_hadees_in_urdu.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_cdc70a42a3294e778897a1b38f59f246.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/5475889680.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_52f698650b134eed96d36d5181933262.pdf?index=trueIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_aeab8b3122d746de86d9dd1145adc5a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/telasebisu/sosajagux.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_605d651023bb41d9ab2225368f4ff1ef.pdf?index=trueIn 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_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 5228 bytes
SHA-256: bd0803e49f4c4f9d694920a5903c95b45acf2bb3e83893894106d0a68264d14a
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 10692 bytes
SHA-256: 3223cf4f4722c987295bdff365cc929e43adcc2f7e99c7842e0049e0f2e66b13

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