Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e61ed71e08a976…

MALICIOUS

PDF

81.3 KB Created: 2021-04-05 10:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 65e11151761c10bcabc6dbd85587d123 SHA-1: 2856eba6fc9233e24505e3fbb37b85ed3c8590a6 SHA-256: e5e61ed71e08a976e2d38301323b4ca0e5626f159a2778ab0f18e012ee9b4045
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of multiple external links points towards a phishing or malware distribution scheme. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=logan+paul+song+the+fall+of+jake+paul+lyrics PDF link annotation
    • https://cdn.sqhk.co/vesagivara/zN7ijca/zamanararoletapij.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/rrhJhft/bidajetogidok.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/sokoket.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/fadasiwivanipu-kuzebovu-rifabibolojiwi.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/33278751886.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/sarikumuje.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/8lggifH/tapsnake_virus_removal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485576/normal_5ff9df041fd53.pdfIn PDF document text
    • https://mapizijef.weebly.com/uploads/1/3/4/4/134493838/winogukorulidu-nabagibemaruruf-zufasi-vokogunazur.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/dvhenii/boat_images_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/tLifg00/dibut.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/metawagemol.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/eMQwu3n/zara_sale_usa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388608/normal_5fceb10f6da94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_04174a3130e9412d9f0936eca4a1f109.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_4e6e37bec31143cdb649d2cea6d1b3e7.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_0eb270f821814312ba162f2e737330ab.pdf?index=trueIn PDF document text
    • http://bivojeda.atwebpages.com/82121065700.pdfIn PDF document text
    • http://sakogabutal.onlinewebshop.net/32261628921.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_9815428cb2d9434e880bd9338f45dd4e.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_2c61429c21bd4194b2be1af523c7910f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 5340 bytes
SHA-256: d8ffa60e42635f1e26aee56f3c38cce3d1a94b8f72a0f11d2ef43e75e4051820
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 10620 bytes
SHA-256: 72ac861bb05dca5c36f9ff2a1c9e1f9a10e7b5d02c4f6a74f8f4c3458d4b2df5
font_02_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176