Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78d0e797f64ff4b…

MALICIOUS

PDF

78.9 KB Created: 2021-03-30 02:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e71a763d6464cb64afd7c503101b6235 SHA-1: d63777edf1e87a98e573bd76382ba1939ee5dedd SHA-256: f78d0e797f64ff4bdd95a5afd8e4f494b69d96913482ab3857ea54e45f1ec077
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains an embedded URL pointing to a malicious domain. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. The presence of PDF_URI and EMBEDDED_URL heuristics, along with the ML classifier and ClamAV detection, strongly indicate malicious intent. The primary attack vector is likely spearphishing, with the embedded URL serving as the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://vilenefex.ru/wix?keyword=chapter+2+chemistry+of+life+answer+key
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/gapobifafakumivu.pdf
    • http://otshelnik.net/xavuvupufewezevibomacln4f.pdf
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/af24d067df98.pdf
    • http://nakavadibukukep.22web.org/petsafe_stubborn_dog_collar_troubleshooting.pdf
    • http://microbestdigitalmeter.xyz/81954189430u8qv9.pdf
    • http://trokot-roznica.xyz/dalidapopowilk5.pdf
    • https://tudiputowol.weebly.com/uploads/1/3/1/4/131452732/surusix.pdf
    • http://pmaider.com/wiweguzepsnd0v.pdf
    • http://tesidakikize.iblogger.org/manual_auto_off_light_switch.pdf
    • https://mopamosaxute.weebly.com/uploads/1/3/5/3/135322262/jovolewibipuzej.pdf
    • http://dvestideyli.xyz/wujorik1ilkf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/700b0d43-862d-4dac-8c79-b8e54f2d51e8/jawegamijelidedogo.pdf
    • http://zetinemimofoti.epizy.com/5117044926.pdf
    • https://uploads.strikinglycdn.com/files/60ecb84f-eb88-464b-959d-268f2b60e537/how_do_you_start_a_slam_poem.pdf
    • http://dakovemusurevo.epizy.com/simile_and_metaphor_worksheet_7th_grade.pdf
    • https://uploads.strikinglycdn.com/files/cf182607-2236-49f9-9d80-31ab37c00fca/95855879564.pdf
    • http://tokofelutuj.epizy.com/mowakesejulew.pdf
    • http://zafuriket.rf.gd/how_can_i_tell_if_my_water_heater_pilot_light_is_on.pdf
    • https://uploads.strikinglycdn.com/files/eec515e6-b124-4fe4-816d-0d4a3fabb11d/1d4chan_30k_legion_tactics.pdf
    • http://mevidow.epizy.com/12935374657.pdf
    • https://uploads.strikinglycdn.com/files/cdb596e8-9b9b-47f5-8bb0-ae12d5e739f4/11758057343.pdf
    • https://uploads.strikinglycdn.com/files/7c10e359-fcc9-4d12-b694-fd6c409cea3c/72258177180.pdf
    • https://uploads.strikinglycdn.com/files/7559926c-fabc-43a2-9d35-703a36b030d7/45773494627.pdf
    • http://gomanezobovo.rf.gd/literature_review_on_automatic_voltage_regulator.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a1.bin
b320e4cd8bf9d84e1cfd4d9895a1e93c4e818664554307f888d87f315c444de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 5552 bytes
font_01_sfnt_off0001086d.bin
e4f40080e6cdcded8b400752267f68f1fbfb85cf91223f7e626b4452228536ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 11284 bytes

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