Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49a9a15dbe6f59b…

MALICIOUS

PDF

81.3 KB Created: 2021-03-24 06:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3311efacc75ce783ea7f9ef431503608 SHA-1: 24966509bb56ce16e2df138fd36cd30dcaa22538 SHA-256: d49a9a15dbe6f59b122155a2cd87a29e2a95cc1b702e7e77e8d9dacdb4cc930a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to PDF size reduction, likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=indesign+reduce+pdf+export+size PDF link annotation
    • http://reznitskygallery.com/canula_de_guedeluzws5.pdfIn PDF document text
    • https://nivolepefusux.weebly.com/uploads/1/3/4/8/134886615/5489949.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/6357559.pdfIn PDF document text
    • http://emmetrix.net/721154814084urw1.pdfIn PDF document text
    • https://kefozonijufan.weebly.com/uploads/1/3/4/6/134689321/zelafule.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/133832473504ep7o.pdfIn PDF document text
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/vupubuxikatep_miwirag_fomazusuzotonun.pdfIn PDF document text
    • http://idealica-italiaoficial.site/fejinuvodokajaie2b1.pdfIn PDF document text
    • https://xewomilofapo.weebly.com/uploads/1/3/4/8/134878854/tidezujakupabo.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/zakonediw.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/xoxokoja-tiboxon-rukesozifune.pdfIn PDF document text
    • http://wasodez.22web.org/carb_cycling_diet_plan_uk.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/wexiralotarix.pdfIn PDF document text
    • http://trenketo.buzz/xixijenizele0xssd.pdfIn PDF document text
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/1e307cbb108ec7.pdfIn PDF document text
    • https://dokerawu.weebly.com/uploads/1/3/4/3/134313580/jepulelulebofawojeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_d33ab1cc11244a07a9eb2c46b82279dd.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_3c196d5c24534855a107c3a73a7ad3c1.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_5fb7936d3d624866b17727bdef9e1b62.pdf?index=trueIn PDF document text
    • http://kajonefev.rf.gd/how_to_write_an_absolute_cell_reference_in_excel.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_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 5136 bytes
SHA-256: 9ad815911ca10395b8f25992cede0b04c920088010c23b8e4e094215096484c8
font_01_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 10864 bytes
SHA-256: 088e00848979a59fa112eecdf5e5763d4815a4443991beff2b1644b8eff39c42

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