Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cebe1ad86c2a10…

MALICIOUS

PDF

87.5 KB Created: 2021-03-06 00:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 937f9b25792fb5c1fe815e91a418c8e2 SHA-1: d0ffb408c4e41008cfc94d3fc1a1951e026fd606 SHA-256: 12cebe1ad86c2a10efebb82f44d0275f9287aaee44dd24fc1517a075d7fd071e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous external URLs, with a significant number pointing to disposable hosting. The primary purpose appears to be directing users to potentially harmful content or facilitating further exploitation through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/aws?utm_term=what+is+instructional+leadership+style PDF link annotation
    • https://cdn.sqhk.co/xupodafib/idohakV/karetomusizu.pdfIn PDF document text
    • https://cdn.sqhk.co/fugutexifi/gidFHJe/dorimibitukomew.pdfIn PDF document text
    • http://vipadminler.org/60668799552oqt1s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_6042a9e9579e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_602703b2abd7c.pdfIn PDF document text
    • http://submonster.xyz/dragon_ball_legends_twitter_friendship_pointsxo8vl.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/CsyJjdg/77542353340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_6041ab7a3c2d8.pdfIn PDF document text
    • http://buybritishcat.com/miwosogizu71tmk.pdfIn PDF document text
    • https://cdn.sqhk.co/jimatoju/dANklie/xatevezukebaziben.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/pn8wThi/90530391650.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/c4Arxhi/vajegeguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_602ea6ee99013.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/Ciaigpp/avenger_layout_xcom_2.pdfIn PDF document text
    • http://radanews.site/rakuten_marketing_consent_management_platforme3t6m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_3e102ba78086426bb675ed5d5219a71a.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_096985b3352841e8a6edc95935176c89.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_592c321dcec048c09ee8f0d16b270559.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_c38f360262e840af84a57405d4f81439.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_9c2a4afc02084520abea3f4a9cba1c53.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_da0ac111815c4ea29b84dc9cd9ee4a3c.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_0237d83e8c994e1d9714c1b7a46467fd.pdf?index=trueIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_2d3acaf2f35745c6b1431bf47424b808.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_bf297da1baae4eb994a34d2a1278736f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 5276 bytes
SHA-256: 483bc3e4f2e4bf1cd1e965b8bf02b362bc4d192793a123cd4bf07c9d2e3d7fc9
font_01_sfnt_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 10764 bytes
SHA-256: fe74a156a992ed6febdd816cf5f7730dfd0207449cab600443e2e92feb28a010
font_02_sfnt_off00013aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAA 16112 bytes
SHA-256: e9f71365a2a9ea4b152c2f6701d7ccf33f67bf216d443f7f7b47b7c3311bc682

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