Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37aae0c5f329a0a…

MALICIOUS

PDF

78.6 KB Created: 2021-04-07 09:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 48670906ba048317d9adce2e57c95c8f SHA-1: 8a0284640bbe9fdc08f6231f2c49821054a434a6 SHA-256: b37aae0c5f329a0a34a1c1bbeda556484613aeba66564acb58f8a90c0d62cc50
186 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 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/award?keyword=chapter+5+electrons+in+atoms+pdf PDF link annotation
    • http://muguwadijalipov.22web.org/how_to_collect_peanut_bush_in_hay_day.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/a32e28c0.pdfIn PDF document text
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/kinazenomufufam.pdfIn PDF document text
    • http://yoga-fitness.space/the_standard_brunch_menu_nycwk7ap.pdfIn PDF document text
    • https://dafuravo.weebly.com/uploads/1/3/4/8/134862971/tojeguboxirijunom.pdfIn PDF document text
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/08c45d46d39e0bc.pdfIn PDF document text
    • https://gabusuve.weebly.com/uploads/1/3/5/2/135297202/dff32023f34f716.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/vurixawax-kulujugobi-selukukikeve-zures.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ff0c46d393f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467274/normal_605f872acb904.pdfIn PDF document text
    • http://fastpeysistem.online/ar-15_lower_receiver_machining_dimensionst1nav.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/fender_super_champ_xd_15_watt_tube_amp.pdfIn PDF document text
    • http://revuriwagiro.epizy.com/vovozonekoloragunajepube.pdfIn PDF document text
    • http://badugumafuzalij.rf.gd/xemodebinuvumube.pdfIn PDF document text
    • http://tuzegonu.rf.gd/verb_tenses_chart_spanish.pdfIn PDF document text
    • http://tarinag.epizy.com/android_9_easter_egg_flappy_bird.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/introduccion_sobre_presupuesto_de_capital.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/apa_format_bibliography_website.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/best_new_yorker_magazine_cartoons.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_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 1872 bytes
SHA-256: cf373f8eb364677dc8d29ae0cbe658a1b8665e9067f0cd69b3a2e84d4b370a53
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 5424 bytes
SHA-256: 803acc696244b0f9571ee2e7e67ea9c48c47f9d6302eccd69de7f5f15cc4f489
font_02_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 10828 bytes
SHA-256: e1be4e45616e59be52f2b181263fdae83032f61e17a295e73b188f4b7a11f4ac

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