Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b8d129dfb9ba90…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 09:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 44356be1fdae565702def7e31253de73 SHA-1: c4e68dbb6119c1af5030478265e83b341910b570 SHA-256: a0b8d129dfb9ba90e9930af13effdcd1aa217c170af439cf727ef3bb4abf0428
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=what+is+the+yellow+button+on+logitech+k400 PDF link annotation
    • https://fafamamijusoma.weebly.com/uploads/1/3/4/3/134371196/diwepuduvamojun.pdfIn PDF document text
    • https://cdn.sqhk.co/sewoliwadumi/aidiN1A/megan_rapinoe_jersey_sales.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/hfynPiR/13062460435.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuxezaj/mjiherF/shelterlogic_greenhouse_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fffb3f520405.pdfIn PDF document text
    • http://albl.ru/frame_relay_packet_tracer_laby5nlw.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/3GjaLn3/putugazadabatud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5fd78caee8c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_5feaeb6d784a9.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/WhivKjf/fluffy_bird_toy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fda7c4f0dbfd.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/whjFzge/tazat.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/JzRgjib/jitalivirixuberek.pdfIn PDF document text
    • http://instahelpforbusiness.com/bikiradikebevubekaddw26j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368998/normal_600260ed765e8.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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 5608 bytes
SHA-256: 0d5110f5b68c661047a8b1a7555e22c7b9aa671d30504ea35269917ef0046152
font_01_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 11304 bytes
SHA-256: dac36058e03eefaa75666472b953b1470088d1e438a02f5934f256b3c9acddb4

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