Malicious PDF — malware analysis report

Static analysis result for SHA-256 344ff8c3d74ae187…

MALICIOUS

PDF

94.9 KB Created: 2021-03-31 00:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e9f066006dc71086be7826f128acc9ae SHA-1: c2a34a847061399e781d8b07456d5e211719ddc4 SHA-256: 344ff8c3d74ae18733ecfa26f799ec6ecf31690082d328063ad0ac8e7886356a
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting domains and employs link farms, strongly suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/123?utm_term=upstream+intermediate+b1+workbook+answers PDF link annotation
    • http://pidagenavuziw.mywebcommunity.org/frozen_shoulder_rehabilitation_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/xepubijiko/0mShQuy/gikezigikisefize.pdfIn PDF document text
    • https://cdn.sqhk.co/mebereserab/V1mF0J9/5k_to_10k_app_android.pdfIn PDF document text
    • http://busijizi.medianewsonline.com/bartenders_guide_download.pdfIn PDF document text
    • https://metelegib.weebly.com/uploads/1/3/1/3/131380803/ganekokagetewed_xitutux.pdfIn PDF document text
    • https://farenutatovepo.weebly.com/uploads/1/3/4/5/134502273/46706.pdfIn PDF document text
    • https://cdn.sqhk.co/fekerepusa/eggijhf/costume_ideas_for_men_2020.pdfIn PDF document text
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/juxado-vudef-kogemevuja.pdfIn PDF document text
    • https://rotafejejulivis.weebly.com/uploads/1/3/4/5/134599198/kegawevabalinujenuda.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/95363149148.pdfIn PDF document text
    • https://cdn.sqhk.co/rotefuver/kXYiggf/brent_crude_price_live_in_dollars_bloomberg.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/4b69f93a7693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/koferojipakarirafit.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/zegineduxelik.pdfIn PDF document text
    • http://jesudojisa.rf.gd/history_of_early_childhood_education_in_zanzibar.pdfIn PDF document text
    • http://monulaw.epizy.com/chemische_formeln_zeichnen_word.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/kuvamofulosefupised.pdfIn PDF document text
    • http://gejajute.epizy.com/automatic_motorbike_stand_slider_project.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_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 6212 bytes
SHA-256: eee31a8c539672f63eea170a052fdd030ec12f15c765e2cb7185788ce0f83ab2
font_01_sfnt_off00013207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 5412 bytes
SHA-256: 9341036cb901b3d30292d4c2887b5f396d5786caa2a0a613b10ec2ba667fc14b
font_02_sfnt_off00014469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 13200 bytes
SHA-256: 5f9b0ea639cfdaefadc9606601429e7d2b73dc4555f93a4aebe9d96a64def22a

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