Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aa634911828f1e…

MALICIOUS

PDF

67.9 KB Created: 2021-03-06 14:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa12d52593d2fab51f16f1adcafe1928 SHA-1: d0ac72780d19406897b29a70427a8c5a935f9753 SHA-256: 41aa634911828f1ea6628907db7724c863d4ef522d0bcb56a8edb6f0aa039f68
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links designed to appear as legitimate content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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-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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/123?utm_term=arbonne+host+reward+specials
    • http://xiwupulo.medianewsonline.com/94238294118.pdf
    • https://cdn.sqhk.co/wibetaxor/agf3gjA/hku_uprint_price.pdf
    • http://gemofesane.medianewsonline.com/24176195365.pdf
    • https://cdn.sqhk.co/jelivapizivo/Nidnthj/excel_homeschool_planner_template.pdf
    • https://cdn.sqhk.co/sevigexew/bigII9g/xibuluwi.pdf
    • http://vuzuwul.getenjoyment.net/lincoln_sa_200_redface.pdf
    • https://cdn.sqhk.co/zodunoxurob/hajcahd/taking_notes_on_ipad_without_apple_pencil.pdf
    • http://gedadekenoz.mywebcommunity.org/saganivugu.pdf
    • https://cdn.sqhk.co/xonipavu/gddjjig/20969692603.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_63e03c7751e644d2aace56c01c0821dd.pdf?index=true
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_acfd744757214ed8bd583da9b192dbe9.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_701a2560263a45619a983334cdf24e99.pdf?index=true
    • https://s3.amazonaws.com/fazujo/datasheet_arduino_uno_atmega.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_c4190fbc211d4fbaaf3a0df84f723dc7.pdf?index=true
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_7770fb8f722e427a9406391f07299833.pdf?index=true
    • http://vikelesifuxuli.rf.gd/99457862368.pdf
    • http://pusevim.epizy.com/aashiqui_2_jukebox_full_songs.pdf
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_6677e6520dfb48a8b974abf72aa9395f.pdf?index=true
    • http://fukokikedusej.epizy.com/pobenetufiwarixuse.pdf
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_284e6988eb3d42fb950c91783294ac4b.pdf?index=true
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_d1b7f9dd41c14b46913dfbadc8a9bf62.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/25950935369.pdf
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_ecfcf17406da4e9e9d84d3848d69e243.pdf?index=true
    • https://s3.amazonaws.com/xofalepelala/muviwax.pdf
    • http://merawaboz.epizy.com/71578720480.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_off0000cdb7.bin
b1ae0f579b206e68f77d8132cf618e4478eddb2e638b6fc21d41e02ae64538cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 5384 bytes
font_01_sfnt_off0000e00a.bin
cd1f6e0c059b107c32cdaba5a9bd48c9ef42523c0c771ad973cb659d780c1eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 9968 bytes

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