Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf11d2d747888751…

MALICIOUS

PDF

74.4 KB Created: 2021-03-18 06:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 549f267867c202a24a0a0f8c1028af90 SHA-1: c34b6b6693e7e304d60b4dc14c11973c7901e783 SHA-256: bf11d2d7478887519d3a0de91df2e0c6148340bae1791e01127981a4401ee370
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a mass of external links, with one primary URL pointing to a suspicious domain. The presence of embedded links suggests an attempt to redirect the user to potentially harmful external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-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://leonvi.ru/wix?keyword=citing+lab+manual
    • https://cdn.sqhk.co/dodiniwotud/gcnaAZB/custom_keyboard_color_changer_laptop.pdf
    • http://dedezitomurepu.iblogger.org/woduvagagasutulo.pdf
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/loniwagagi.pdf
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/zurefokulewawo.pdf
    • https://cdn.sqhk.co/rexazileka/hgifgfa/lumetozeforororer.pdf
    • https://cdn.sqhk.co/pudibamune/hhdhgia/background_pictures_for_photoshop.pdf
    • https://cdn.sqhk.co/faroziwe/gcPhjiQ/live_nation_tickets_legit.pdf
    • https://disebaxixifos.weebly.com/uploads/1/3/4/7/134714932/56c08358b78126a.pdf
    • http://dapabikokewe.iblogger.org/uw_tacoma_equivalency_guide.pdf
    • https://linoraza.weebly.com/uploads/1/3/1/4/131437671/5176903.pdf
    • https://dovedesomubax.weebly.com/uploads/1/3/4/4/134487211/ad8d14f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_20f0459d95624b43a812048719788b8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d415dcc-8b6c-416d-92e3-2e6e80ea1393/todetewirawakusigiwedej.pdf
    • http://zivuvosiz.epizy.com/alone_girl_wallpaper_240x320.pdf
    • https://uploads.strikinglycdn.com/files/425ed820-729a-49ac-9920-21655008a724/is_cfa_tough_than_ca.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_cb2cec46345245c4bde1dff788be23dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/748410e1-1d07-4949-aa38-1a968cb492db/xurexe.pdf
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_c34ed33a4f1f4e1988e0686b765f93ca.pdf?index=true
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_27f6ddd46c9d401da212a2a00962db56.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_3ad351491ce3453993fffca9fe4398f4.pdf?index=true
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_1b2ce8093e54454fb72ee90a6daa0a97.pdf?index=true
    • 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_off0000e7ed.bin
322e8aaff628ce2d32be3278d7d616435a73e08e41a103a19389dc3aa01a62dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 4776 bytes
font_01_sfnt_off0000f81f.bin
c6507d4cbf009307dd06b9cee08a9b42a690461b96ea93ca851769c1f67ee696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 10800 bytes

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