Malicious PDF — malware analysis report

Static analysis result for SHA-256 354f4b2be6e61252…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 07:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 56bb3d55158426f6aa7bd7f822bb01db SHA-1: 5ad128110e0393f1f66daca6c557fdded110b869 SHA-256: 354f4b2be6e61252a299419aa4e23f5880ba0ffe510d45d59ffad97bba0adab3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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.
  • 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=geometry+terms+worksheet PDF link annotation
    • http://lofoporubatul.mygamesonline.org/32102475130.pdfIn PDF document text
    • https://tonefomemozev.weebly.com/uploads/1/3/4/4/134458928/jiribud.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/Mihdbja/tobobofepaxije.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/lincoln_electric_ac-225_stick_welder_manual.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/what_are_the_basic_principles_of_language_learning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_600002727b217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_604d03a552473.pdfIn PDF document text
    • https://ranutejojem.weebly.com/uploads/1/3/5/3/135314135/2c7ee460ea2.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/0ce201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_6030e5a48b43e.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/calendario_escolar_malaga_2020.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/zotugenobofug-xokakan-zarivakafen.pdfIn PDF document text
    • https://cdn.sqhk.co/nudotunaza/Rigjgmi/legumoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ffcfc850cbda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/besafefaf/tasalowurunesudure.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/rikilopuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/how_much_is_nigerian_navy_paid_monthly.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/gafirajegi.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/bahishti_zewar_complete_english.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/44360293333.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/jodejuzas.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/60802569423.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 4604 bytes
SHA-256: ef55d1bea6f204563d51402ca26001131155b082f3601ce47b605842a87f95d1
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 10792 bytes
SHA-256: 131ec77b633b77eb2a80a2bb2db883924151910015207b1400c5e9685dcde64f
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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