Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb4f75b228064b5…

MALICIOUS

PDF

81.3 KB Created: 2021-03-29 20:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f27b65b8a7833362c66149f4a9358fa5 SHA-1: c8eecaa4eb931fde95843fde5e11230967fd6335 SHA-256: 3fb4f75b228064b5cfd31744fd2232e0e2dcdb63445c41ab739bf09e4e90928a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, 'https://crophysi.ru/strik?utm_term=laptop+cannot+connect+to+fios+wireless+router', suggests a phishing lure related to technical support for network connectivity issues. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=laptop+cannot+connect+to+fios+wireless+router
    • https://static.s123-cdn-static.com/uploads/4418781/normal_5ff3f7f9b53b8.pdf
    • https://cdn-cms.f-static.net/uploads/4421781/normal_605fb4551c2fe.pdf
    • https://cdn.sqhk.co/safimowexaw/2VYhdgj/mokut.pdf
    • https://cdn-cms.f-static.net/uploads/4387826/normal_60102cae83153.pdf
    • https://cdn-cms.f-static.net/uploads/4446165/normal_60229246ca3df.pdf
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5fc8dcf3a1ab0.pdf
    • https://cdn.sqhk.co/leruwexikud/jaFiagg/dibels_letter_naming_fluency_practice_sheets.pdf
    • https://cdn.sqhk.co/wejemabip/3eRiYgi/nulokaluraf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jadere/centric_rotors_application_guide.pdf
    • https://s3.amazonaws.com/neporezofov/arduino_programming.pdf
    • http://taroveruwidiba.onlinewebshop.net/mojabe.pdf
    • https://s3.amazonaws.com/nevovumowa/55419799395.pdf
    • https://s3.amazonaws.com/mogipegi/acute_spinal_cord_injury_treatment_guidelines.pdf
    • http://zevesijuduma.atwebpages.com/beauty_and_the_beast_piano_sheet_music_ariana_grande.pdf
    • https://s3.amazonaws.com/jedobufudajewu/46284689789.pdf
    • https://s3.amazonaws.com/lebaxa/11899224973.pdf
    • https://s3.amazonaws.com/wiwamoxamo/dirogagojojovawuv.pdf
    • https://s3.amazonaws.com/tidigudetefumof/how_to_make_garlic_sauce_for_pizza_recipe.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_off0000f382.bin
ac16f7e0961550e29475582b0d7fd577f867c53add0cc7cfabbfd813542bff07
pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 4924 bytes
font_01_sfnt_off0001045d.bin
6c1d0a61116ac3b1ba5aaaf14556e6502d3f7c4ddb07503f1374284258d806fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10824 bytes
font_02_sfnt_off00012938.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 4324 bytes