Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f51cd712ea78b9…

MALICIOUS

PDF

113.6 KB Created: 2021-03-16 18:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a2db85356a6ca63139ad9ae7ba0ada9 SHA-1: 2cd4eaa1bc95d2f87438d49d10bd66da08e803e0 SHA-256: c5f51cd712ea78b90f23db683867c0c06ef8a983822f42e963b4c4d147cc02ee
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to a domain that appears to be part of a phishing campaign, disguised with keywords related to product instructions. No scripts were extracted, but the PDF structure and embedded URI heuristic indicate a likely attempt to redirect the user to a malicious site.

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://golowaki.ru/wix?keyword=bandai+perfect+grade+millennium+falcon+instructions
    • http://japancar-sib.ru/48343690584g8bzo.pdf
    • https://cdn-cms.f-static.net/uploads/4859805/normal_6035b5a996e90.pdf
    • https://cdn-cms.f-static.net/uploads/4455178/normal_604805e5712c1.pdf
    • https://cdn-cms.f-static.net/uploads/4401694/normal_603b27f1dd022.pdf
    • http://mon-cmb.best/xudepirimowexepkxjm.pdf
    • http://sis-paypal.com/kezelozizapekix48r8.pdf
    • http://portkamesto.site/gimunegawibagimisapbv89.pdf
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5fca5f7386a4a.pdf
    • https://cdn-cms.f-static.net/uploads/4489247/normal_6025ccefe9c16.pdf
    • http://burrrhey.tech/7461278868643gda.pdf
    • https://static.s123-cdn-static.com/uploads/4403683/normal_5ff7969c8f5e1.pdf
    • https://cdn-cms.f-static.net/uploads/4391340/normal_6009f4be3b566.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3e0c42a1-3848-4e72-a2b5-f0fd43fd55c0/conversion_de_milimetros_a_pulgadas_en_herramientas.pdf
    • https://uploads.strikinglycdn.com/files/492fca62-eaeb-4a46-b559-6bead06df651/stephen_king_quotes_the_scariest_moment.pdf
    • https://uploads.strikinglycdn.com/files/b555c53d-7a9e-4f9a-988a-ef209dca0b46/what_does_the_bible_say_about.divorce.pdf
    • https://uploads.strikinglycdn.com/files/ffdf1b34-d092-4e8f-8008-57faf232580b/why_wont_my_kitchenaid_oven_turn_on.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_off00017d60.bin
dfceeacc90cd09e7bf9b43a77cdfcc3c617bc962dd407e8bda7d2d3278a2842c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D60 5524 bytes
font_01_sfnt_off00019018.bin
760363b573beabf6ea0cb4c2f6f88053920dd058f4cb647ff4a609a8bb386be6
pdf-font-stream PDF embedded font (sfnt) at offset 0x19018 12120 bytes