Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e3934e74e63edd…

MALICIOUS

PDF

77.3 KB Created: 2021-03-14 02:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a448c27136590e2503eb2a76c5086db SHA-1: 85f8f24c59ce9027140cc326566b78b12244477a SHA-256: a2e3934e74e63edd5d6bc5e6cb35db5f27c8fc8110090384f35c122007ee56c0
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/wix?keyword=remoteapp+windows+10+update PDF link annotation
    • https://cdn.sqhk.co/mozoposowi/gihdQpg/big_head_basketball_garrison_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/OllLje0/blinkist_premium_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/bUnTV8S/crash_dive_tactical_submarine_combat_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_602e5ac73e978.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/hj3jfGY/pivemixuvirorogutaxan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_601ab780abd2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_600ae9ac73d53.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/gihirjb/alone_malayalam_status_video_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_604d3e4736c1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eacb490b-4a06-498b-9a1b-aed354bd467c/hp_printer_c4580_print_cartridge_missing_or_not_detected.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_90d0c704f6b24a26baaeb9baabfcc0dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/ch_play_android_6._0._1.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/3d_effects_photo_editor_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/navovakopevepatamavoro.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_b94a3c14d96e41208aab30206f054d3f.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_c2673691945f4e7bb64c6789b26cf337.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_0bbba2af22924331abc48c79f066794a.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_44540bad0fb940018a9f7725f5eb904b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c03e48a-8310-427f-b66e-f43f818d5bfc/what_is_the_molar_mass_of_3h2o.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_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 5272 bytes
SHA-256: 180dc975544ff73fdc467d2bdca333884d327d1c676c08fb2ea1f35509c895f1
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10772 bytes
SHA-256: 22b2e13d41154c913cf2bd15e8285ead068ecb3cbfc5356cccf2c7e7f85cfe00

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