Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ffb3fd946d7eaf…

MALICIOUS

PDF

85.6 KB Created: 2021-02-19 23:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: dbb3242665cf19f65358f3f61af104f7 SHA-1: 5de2c0edad8171b5b8d81d60a4c9a773f9f1c934 SHA-256: f9ffb3fd946d7eaff8b620f307f598bba1f9abbf7d412426274c0bdb3a8ba55d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of external links, many of which point to benign content, but one critical heuristic identified a link farm. A high-severity heuristic indicates a lure to execute commands via the clipboard, suggesting the user is prompted to paste commands into a shell. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://baarspo.ru/123?utm_term=how+to+read+pdf+from+terminal PDF link annotation
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/1336528.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/kasowisokapedapi.pdfIn PDF document text
    • http://zufabud.22web.org/how_to_pair_remote_directv.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/c4042ff6.pdfIn PDF document text
    • http://mowewuwopirot.iblogger.org/65606511331.pdfIn PDF document text
    • http://winopufivugum.22web.org/80387630610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jukoxisojow/apk_brainly_untuk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/bhojpuri_video_song_full_movie.pdfIn PDF document text
    • http://xixesasix.epizy.com/diamond_one_touch_video_capture.pdfIn PDF document text
    • http://pavoserelolaw.epizy.com/lead_sheet_music_books.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/compressed_air_material_safety_data_sheet.pdfIn PDF document text
    • http://dojopugoput.epizy.com/brain_teasers_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/12272835847.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/6887637264.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/77931702277.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFB 4852 bytes
SHA-256: adc89a60e7e43eb1e6e5d07e011c4b4b35668687685b7626946fda5a9004da79
font_01_sfnt_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 6176 bytes
SHA-256: d8e22b7dbc39ffa322145f65807c72deb1742a9904e3887d6f94900292b8d953
font_02_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 3952 bytes
SHA-256: aaf901dac24722eb4487aef6cf536e9f3700a905cab6249af6dc4b71174eaa75
font_03_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 11772 bytes
SHA-256: f14fd28b79efdd1860a070e253b4fdc96f1f90db71b673af4c13daf9a1f773a5
font_04_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 16492 bytes
SHA-256: 86f0cdb313824039da90733caace7ac13388a7bc5b61c62ee1289ca2c886f6f9
font_05_sfnt_off00013a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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