Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bec838386809224…

MALICIOUS

PDF

83.7 KB Created: 2021-03-17 04:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 742b543a79378e89b5b8a8dbea1470a1 SHA-1: 0a8079e4f7d3241d92169ab309f87b8dc81f4aef SHA-256: 1bec8383868092245b1583c860a83e93535b0994bc2d76a8ae0f6ee36de35f33
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. Crucially, it includes a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for downloading and executing secondary payloads. The primary IOC is the external URL found in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://bologen.ru/wix?keyword=install+oculus+setup+on+different+drive
    • https://bazewubudib.weebly.com/uploads/1/3/4/7/134731154/wafurifabajim.pdf
    • http://epipog.com/sisavinojilemiwakupinurb4leh.pdf
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/radujizofaf.pdf
    • https://pasikozadiru.weebly.com/uploads/1/3/1/3/131384374/lumutep_sokimojozuga.pdf
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/7605cbd5ac49.pdf
    • http://metazoaapc.fun/late_night_parents_guidewedp4.pdf
    • http://kindraretterath.com/desert_worms_brick_rigsobzte.pdf
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/lonomijugukugepi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujodibu/bebop_scale_piano.pdf
    • https://uploads.strikinglycdn.com/files/977ea381-93f5-413a-93e4-b7fa7bc668af/95297089805.pdf
    • https://uploads.strikinglycdn.com/files/dbd69c14-2ba8-4ea6-be3a-2a0dcac98362/what_the_bible_says_about_getting_fired.pdf
    • http://bolusober.epizy.com/81835406099.pdf
    • https://s3.amazonaws.com/gifiz/hunter_x_core_irrigation_instructions.pdf
    • https://uploads.strikinglycdn.com/files/e0ce7e67-3630-4b5f-84cc-a0fd04ed10e7/66344347626.pdf
    • https://uploads.strikinglycdn.com/files/9f4d260f-274c-4402-b583-7348620ee741/28771146588.pdf
    • https://s3.amazonaws.com/bokelur/dubilopukebajevabodupul.pdf
    • https://uploads.strikinglycdn.com/files/fbe681ba-53a6-4795-898b-5bcca086014c/gelofasobixaxogoga.pdf
    • https://uploads.strikinglycdn.com/files/893ed355-d08d-461f-802e-32112976b4af/how_to_find_wps_pin_on_canon_printer_ts3122.pdf
    • https://s3.amazonaws.com/limepusotanal/sabubejudemabas.pdf
    • http://dosusixajamatef.rf.gd/tijupotodewanomututadesad.pdf
    • http://xizilagitakov.epizy.com/11094117555.pdf
    • https://uploads.strikinglycdn.com/files/36e010e3-ee4f-4829-af43-bd6efe723f25/77813116536.pdf
    • https://uploads.strikinglycdn.com/files/4b12e246-1257-4cf6-a2c4-60c04a339782/kimifojalusokukopetos.pdf
    • https://uploads.strikinglycdn.com/files/96b5201f-97ec-44c9-a563-45fc52333702/nevonug.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb50.bin
bef9414fc76b78f013a15f3a5262048cc371a46c8472e96bd9bbc6b27630f9eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 3088 bytes
font_01_sfnt_off00010659.bin
98121caf3242d6c9f32c3f29c683a964fd89f0c3e18d8000e452f1b514b4ad76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 5144 bytes
font_02_sfnt_off000117f5.bin
72b7d5844d181ac8b69bccddad18e1dc03d7bc5cdfb89fc1f158bb4b5e7d4e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 11292 bytes

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