Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb90d9f73e6b5d5a…

MALICIOUS

PDF

94.7 KB Created: 2021-03-20 03:38:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b8b07943124016790b5f01602a16fa SHA-1: d9070555a177fb97c7372596a79d3677a7159253 SHA-256: bb90d9f73e6b5d5a6281b9988a16bdd7fe346f4156aa6a4aab24321a393d7e62
196 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs, with one prominently featuring 'f movie apk update' and pointing to a suspicious domain. The 'SE_CLICKFIX' heuristic indicates social engineering tactics designed to trick users into executing commands, suggesting an attempt to bypass security measures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://vilenefex.ru/wix?keyword=f+movie+apk+update
    • https://fabisinutufonos.weebly.com/uploads/1/3/5/9/135993578/8402028.pdf
    • https://static.s123-cdn-static.com/uploads/4494877/normal_5fe554e96135e.pdf
    • https://static.s123-cdn-static.com/uploads/4409250/normal_5feff5faeefd8.pdf
    • http://hairsprof.ru/505654388773et59.pdf
    • https://tupuzozen.weebly.com/uploads/1/3/4/4/134403730/gomubin.pdf
    • http://6gusevshop.website/sections_of_cgst_act_20175w6pt.pdf
    • https://cdn-cms.f-static.net/uploads/4407102/normal_60454b7276706.pdf
    • https://nipalevix.weebly.com/uploads/1/3/4/0/134017489/dd77c81e9680245.pdf
    • https://wikifezetusu.weebly.com/uploads/1/3/5/3/135306480/nakugitiwepesu_masodenuzig.pdf
    • http://hookup756.fun/first_alert_carbon_monoxide_alarm_test_silencelllxh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_7b19d9c412224f16a3340b7b392a9bae.pdf?index=true
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_626a312943da4f49a8af9be53d4f1a73.pdf?index=true
    • https://s3.amazonaws.com/tobobowu/oxford_dictionary_for_windows_10_free.pdf
    • https://s3.amazonaws.com/gonima/nonegazutebosibite.pdf
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_2f6e278c93a14b7c97394fb6ed4eae89.pdf?index=true
    • https://s3.amazonaws.com/jakujakula/bissell_powerforce_compact_cleaning_instructions.pdf
    • https://s3.amazonaws.com/gixawetopoli/acrostic_poem_maker_template.pdf
    • https://s3.amazonaws.com/zowejunef/game_hungry_dragon_apkpure.pdf
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://scripts.sil.org

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010278.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 6744 bytes
font_01_sfnt_off0001135f.bin
e17fe72a8442b3de8638bf84bbf9c29b254b4c377065882393ffe38aa2071df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 4880 bytes
font_02_sfnt_off000123f0.bin
f034ad139e1d418bf2471bae8a7e833c7891976f7b3a06fc3a997d4b1abaa978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 11748 bytes
font_03_sfnt_off00014c34.bin
32b50e076eb3dba73feade02b9482c171ac34d41442aede6db6042f62bf941cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C34 10340 bytes

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