Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c455b90e047372…

MALICIOUS

PDF

77.4 KB Created: 2021-04-05 05:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a89e1d3976b2a9080c1898022013e368 SHA-1: 50b690a315b1ca793bf104362311278d5d65a7a3 SHA-256: e7c455b90e0473728953caa39a42dd9fc877dee06bbca4e63a207da06685f99e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://pelibifir.ru/wix?keyword=bear+jokes+one+liners', is presented as a lure for 'bear jokes one liners'. While no scripts were directly extracted, the PDF structure and the high number of external links suggest an attempt to redirect users to malicious content or facilitate further infection, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=bear+jokes+one+liners
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/zaziduzosome-pisujiwu-zisejem.pdf
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/723ddee7e77824.pdf
    • http://worelimupuvefam.mywebcommunity.org/stress_concentration_factor_kt_formula.pdf
    • http://zaparipajomigi.scienceontheweb.net/bipolar_assessment_scale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c2c72a1e-ec36-4b0d-acb0-6a242bb8fd37/32940370697.pdf
    • https://3c59ccad-08dd-474b-8af0-a42d91f20399.filesusr.com/ugd/489ff0_823a0275391e425c98c012853e680313.pdf?index=true
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_7ff7d7b9dcd443a9ac51cf811aa99c6a.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_dcd9e701d9f24358a87505d9b8cc5459.pdf?index=true
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_767bfdccc51d439bad574d6d1e188eac.pdf?index=true
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_25e6e4909f994fbf9074ae89cdb9920d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c535d8e-146b-479d-8715-788fcb849a85/ge_profile_microwave_convection_oven_charcoal_filter.pdf
    • https://uploads.strikinglycdn.com/files/4a19411f-2a61-4748-9987-58b1dade0650/what_is_40k_kill_team.pdf
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_55589c5528154cb58972932f3ae0fb5a.pdf?index=true
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_6ed78dd87c904366b969d0818bdd7a67.pdf?index=true
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_994c006107b7458589072633d384f913.pdf?index=true
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_b5d646d9495c437aa800475b086298da.pdf?index=true
    • https://e37fb4d6-fac4-4cb1-96d9-cce2dae532e5.filesusr.com/ugd/ed2751_b9b544526d9e48978bc07a8f4037c5d0.pdf?index=true
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_28a44f298c7d498e84bc43981f2a6cca.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f548.bin
4632929ac59c0b9e3a85cc6b4da3566f2e657b12ae110fcd069e0436d4762d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 4868 bytes
font_01_sfnt_off000105e7.bin
5059401c083faec2fa8215f8921041dc110dd6e3e341a229e5663165c352b600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 10328 bytes

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