Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea8c4aaaac80efc…

MALICIOUS

PDF

89.1 KB Created: 2021-03-14 21:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58b2c5efaf4d4d77d4b9feb2e83ce493 SHA-1: ef384fcf33ba24b2f6b50490f142e4312e101863 SHA-256: dea8c4aaaac80efce1ee5eddbfc9538bf2d9157eb877671e8be27842da852d3c
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to a disposable hosting domain, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=ap+style+dates+month+and+year PDF link annotation
    • http://mareson.getenjoyment.net/85412975679.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/tuxenirob.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/24521398831.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/laxubez.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/16758826385.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/alpha_male_body_language_pictures.pdfIn PDF document text
    • http://tuvuvadirozo.iblogger.org/tijajadelibe.pdfIn PDF document text
    • https://talidifixuj.weebly.com/uploads/1/3/5/3/135390844/013111a2.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/electrical_building_installation_design.pdfIn PDF document text
    • https://megevoweroke.weebly.com/uploads/1/3/5/3/135351245/risebolewij.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/vojonelinudapolumebuloruz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfa1af9-0fe2-4ad3-b64e-a4105ee66c51/gujovosaku.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/allcast_premium_apk_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c454923-d96a-4611-83cd-e91a134f89be/xedixaserarakux.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/sadijakepet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b1d806-6b67-4bed-977d-0abe520fbdda/why_does_my_hp_printer_keep_saying_ink_system_failure.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/kudexurogoluwew.pdfIn PDF document text
    • http://nizexududitew.epizy.com/darupibefunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbcb04a-4689-40ab-b861-6bf549915df6/48692786927.pdfIn PDF document text
    • http://matogidujizovoj.epizy.com/zopuzemon.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/libexebidivawetuzuv.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/rukewuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b5acfa-2aeb-4c85-88e2-982fd5448554/how_to_connect_rc73_remote_to_receiver.pdfIn PDF document text
    • http://sitalagok.rf.gd/how_to_get_ground_state_electron_configuration.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 5288 bytes
SHA-256: bdd66cc80d03c77fd6b0f9454fe4aa2075b620260dbda6402e8f1414193709b7
font_01_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 10988 bytes
SHA-256: ef5dd56ddde3d678d267fb30b05c733ceed736a610083bd35878df437c6a962c
font_02_sfnt_off0001416c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449