Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd50ea54a94af92…

MALICIOUS

PDF

86.7 KB Created: 2021-03-13 15:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 964448de9872876abfb3fbf5e5395738 SHA-1: 4f1926f94717794045e87129204f41e424cccbe3 SHA-256: efd50ea54a94af92bc0ddff35db4878568250c56ff3eda162b69fbe010fd9ee1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_CLICKFIX' heuristic suggests the document attempts social engineering by instructing the user to run a command, likely to download and execute a second-stage payload. The presence of numerous external links, including one to 'midufefew.ru', further supports a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=movie+box+hd+apk+android
    • https://cdn.sqhk.co/luwesefizi/Zgghfhc/beautiful_girl_wallpaper_iphone_6.pdf
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5fcea359704e4.pdf
    • https://cdn.sqhk.co/negenowiji/LgcQhfb/xafugapibozexerewofut.pdf
    • https://cdn.sqhk.co/nefakovuwot/UU7hiKB/43484984171.pdf
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/4200026.pdf
    • https://cdn.sqhk.co/nivodoruw/1hb8uie/escape_room_the_game_app.pdf
    • https://cdn-cms.f-static.net/uploads/4470699/normal_5fda94782d493.pdf
    • https://cdn.sqhk.co/vurikede/jhBi8e9/gamer_lounge_pillow.pdf
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5fde4c99438a4.pdf
    • https://cdn.sqhk.co/powurejur/gdjesgh/jaxima.pdf
    • http://tazizinujumijoj.mywebcommunity.org/how_to_set_time_on_timex_indiglo_digital_watch.pdf
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/85c25be.pdf
    • https://cdn.sqhk.co/mafomawoxali/rijhjiV/falifiparasirutebit.pdf
    • https://cdn.sqhk.co/rojarasam/jfhbig6/cs_timer_download.pdf
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/fupopunovaralov.pdf
    • http://duwudivusupo.mygamesonline.org/chopin_ballade_no_4.pdf
    • https://cdn.sqhk.co/xisofofumew/jgoUigi/15241009764.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_85924bf879df421c827d20587d98f9d5.pdf?index=true
    • http://rovizomaguwex.atwebpages.com/sasuvitanabo.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_937ee987814148b8bb2bc1d6536342ad.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010319.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 6744 bytes
font_01_sfnt_off000113fe.bin
bc85cde7c728d40f8f9ce28a316203bb3fe08903982e1c9a525070c29af9cec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 5172 bytes
font_02_sfnt_off00012599.bin
2c81023a7a17ffec0dc2db2b8910f0194dbf942e8739996a316b19f88b9d07cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 11608 bytes

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