Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9ab8231a43b374…

MALICIOUS

PDF

72.5 KB Created: 2021-04-03 03:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ae6ed5c7f038566572e0504edb058f1b SHA-1: 2eca5e950aed7591c4a279999ff1ba27cd70c55d SHA-256: ea9ab8231a43b374166b1ad0a23c3b8a584bcdf56fcd3f47d1164acdb2b3458c
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF document contains numerous external links, characteristic of a link farm, designed to redirect users to malicious content. The SE_CLICKFIX heuristic indicates the document attempts social engineering by instructing users to execute commands, likely to bypass security measures and download a payload. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary malicious URL being mezovuduw.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://mezovuduw.ru/award?keyword=converter+pdf+to+word+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393204/normal_5fc98821714f4.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/giEAilO/navneet_rana_picture_film.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/40a40030.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/lisudajufasal.pdfIn PDF document text
    • https://rodelifefi.weebly.com/uploads/1/3/0/7/130776661/jezukaluniwozidiwuw.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/bamawi.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/0153d82a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379616/normal_5febfe6a7e918.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/jaWkXii/cosmopolitan_las_vegas_rooms_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_6028f56d75b9c.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/8hggiu5/73967362457.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/y6dhhwx/dezonapizabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_5d9e64118afc459ebfa18e9701b6a25b.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_b709792cff0b498daa41f8c5b0f173ca.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_b0e133afd7a2467e9e03c4cea178d5e1.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_01bbe6c13532481b8ffa2023b7b690d2.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_2303c801701a430b84f228a146e102c2.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_216fe3756312425ea656f15046154608.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 4912 bytes
SHA-256: 1c5eda7416a0db626773e2c0413f7fb4607c8c1eb7ddee5310e12b3f2365a815
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 10668 bytes
SHA-256: bd51db549b39592d940e64930ee9956ebf3688736ecd3c72bfc1845b65cb2d76