Malicious PDF — malware analysis report

Static analysis result for SHA-256 f413ad4b3c425e32…

MALICIOUS

PDF

84.9 KB Created: 2021-04-03 18:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b56cdbaf32120e0bbb23442f0bdf66d5 SHA-1: 263436ed34abe6147840b42632fa2abcbaa21676 SHA-256: f413ad4b3c425e32c5cbd88180a5e7420828dd10b73ff5d88b128b6c610201d3
156 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. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to facilitate SEO spam or phishing campaigns. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=par+quoi+remplacer+les+feves+fraiches
    • https://cdn.sqhk.co/zururodi/egfjaOo/high_quality_mp3_voice_recorder_iphone.pdf
    • https://sorafenime.weebly.com/uploads/1/3/4/3/134320910/nawuzuzi.pdf
    • https://cdn.sqhk.co/gulaxemetila/ghjczic/8424905653.pdf
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/lazajamewoguve.pdf
    • https://cdn.sqhk.co/zolulesar/hbYidQp/lominozuri.pdf
    • https://cdn.sqhk.co/reteduze/eCigick/javiladilumifu.pdf
    • https://fogodaxo.weebly.com/uploads/1/3/4/6/134606017/latobadisukepa_tezogijod_rijotowiwik.pdf
    • https://cdn.sqhk.co/vojofarakiva/jfjeXBO/56376442834.pdf
    • https://cdn.sqhk.co/rubutemoxe/iaZicJT/crimsonheart2_mod_apk_1._2._2_download.pdf
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/9214855.pdf
    • https://cdn.sqhk.co/jidulopavoji/idddy5O/trate_de_olvidarte_in_english.pdf
    • https://cdn.sqhk.co/mozedizupi/ge9haRt/billie_eilish_my_future_spotify.pdf
    • https://cdn.sqhk.co/niwonosorude/iiMie2O/88564208020.pdf
    • https://cdn.sqhk.co/podoxato/h0f16xa/19274031591.pdf
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/1605117.pdf
    • https://kenodijegubiv.weebly.com/uploads/1/3/4/5/134501598/gewixelukotob.pdf
    • https://cdn.sqhk.co/vufisolepu/UhhcMgc/old_pc_keyboard_port.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ligole/27975095435.pdf
    • https://s3.amazonaws.com/pipaneku/teregoloxijifezagupalaw.pdf
    • https://s3.amazonaws.com/wulotugadag/bronconeumonia_infantil.pdf
    • https://s3.amazonaws.com/fodose/cbr1000rr_2008_user_manual.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f462.bin
bbe5dda47a54a2c1f0d0e5f164b8799f88392ae4a733127bf1529ef0f19f5922		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 5440 bytes
font_01_sfnt_off000106c5.bin
0bdafff8b3fc8232f285feecf397e26bf2dbc7edd04fb6b77404cf203ac23bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 12608 bytes
font_02_sfnt_off00012e9f.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 16312 bytes

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