Malicious PDF — malware analysis report

Static analysis result for SHA-256 f017790feb369a87…

MALICIOUS

PDF

95.4 KB Created: 2021-03-26 00:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 118be019b55864b2e77f7d2d591ba35b SHA-1: c25f08e7319dc211a28022b205d5293faadf7b82 SHA-256: f017790feb369a874f95ae45c946220caae3d33d9cbc7865c2faff04dd91926b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content or redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=el+vendedor+mas+grande+del+mundo+pdf+pergaminos PDF link annotation
    • https://cdn.sqhk.co/lifupowaseli/pgPd8Ei/togire.pdfIn PDF document text
    • https://waxamelajawima.weebly.com/uploads/1/3/4/6/134680886/c694efb57047d19.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/JieJnVx/84667948923.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/malabedamugowe_pexilikedikafe_xavojelorilidax.pdfIn PDF document text
    • http://otomail.business/budenanofebaxezofuzokivefn6uw.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/hfjisif/heart_free_download_vector.pdfIn PDF document text
    • http://purpless.vip/dunkin_donuts_chocolate_donut_ingredients6043e.pdfIn PDF document text
    • https://cdn.sqhk.co/lezenelu/gev9bia/adjective_forming_suffixes_ous.pdfIn PDF document text
    • http://mnogoturov.com/astm_b117-_11ogj2r.pdfIn PDF document text
    • http://erogan-columbia.site/32192821169fj41y.pdfIn PDF document text
    • http://fb-ig-copyright.com/lethal_race_hacked_gameogkwr.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/vimejonawov.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/dUOtkzw/30016474037.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/sozidefogu_nutedodafesu_vuduse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_562a6976f6924332b07da73fe6e28269.pdf?index=trueIn PDF document text
    • http://fevoroxigur.rf.gd/nakidibode.pdfIn PDF document text
    • http://samepuwewar.rf.gd/reasons_why_my_ac_unit_is_not_cooling.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/fedinokejonerivewipovek.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_eea337e9a57e40cf8c03a8ec35f26e7d.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_47214d869a4e42529823c0d86e8e98a8.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_70c7f9e5e833422e8ba1a7a24bb12fb4.pdf?index=trueIn PDF document text
    • http://xodemomawul.epizy.com/6474910643.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_6e1c317bcb6a4a488c8251afa3b51183.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusabifef/probability_determining_probabilities_sheet_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/chicago_manual_style_purdue_owl.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_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 5380 bytes
SHA-256: 0b5070a162676b038b8f008d4f705112757c77dcacd55ef1585a2d209e431c5f
font_01_sfnt_off00014177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14177 14172 bytes
SHA-256: 72b7efe62e685ad2c668e1fb2b730b7b953ab4b02c58d694ac23a04989d0610f