Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed66d0e3f37bf66…

MALICIOUS

PDF

83.0 KB Created: 2021-05-08 09:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feab4bc70e24d0dfe9ad7d2d4a31fcb4 SHA-1: 908e89fde13cd70a422561e22a17e53e06587683 SHA-256: 9ed66d0e3f37bf66fffc808bc3c7ee5c07ac386a3b8718f3b8a357ffaa7bacd0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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
  • 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://vilenefex.ru/strik?utm_term=shirley+jackson+biography
    • http://gtmedis.com/pimoxepamovivalarav8zia.pdf
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/noveworubuzikunode.pdf
    • https://vesevowix.weebly.com/uploads/1/3/3/9/133987154/91c891b220aa8c.pdf
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/xunepevogejovevipemu.pdf
    • http://mnclassis.org/the_coldest_temperature_in_the_world_right_nowsbzqk.pdf
    • http://jabilevij.mypressonline.com/82440801998.pdf
    • http://ketosimple.online/wabi_sabi_children_s_bookd2l2g.pdf
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/boraxuradosi.pdf
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/sisunem.pdf
    • http://copyrightram.net/46621576257durd2.pdf
    • http://fevofawemuwa.medianewsonline.com/rofalalikawavojodivu.pdf
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/4082085.pdf
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/bemapotidar.pdf
    • http://wifisef.medianewsonline.com/86496233292.pdf
    • http://arfesopt.com/artful_dodger_movin_too_fastywqw5.pdf
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/8063ed6bf00.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fomobiwudaz.rf.gd/muxexixonerogedasaxoxov.pdf
    • http://kapuvomerar.epizy.com/project_report_on_electricity_billing_system.pdf
    • https://s3.amazonaws.com/nowonovege/pass_member_function_pointer_as_template_argument.pdf
    • https://s3.amazonaws.com/falevi/extent_reports_in_jenkins.pdf
    • http://pofiwun.rf.gd/pafena.pdf
    • https://s3.amazonaws.com/muvojugejoxip/42173821046.pdf
    • https://s3.amazonaws.com/geradi/thai_basic_phrases.pdf
    • http://suxaremulemafet.epizy.com/what_is_the_theme_of_the_book_night_of_the_spadefoot_toads.pdf
    • http://donijexufenu.onlinewebshop.net/clothing_drop_off_bins_near_me.pdf
    • http://tofujuwo.onlinewebshop.net/oral_b_replacement_heads_walmart.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_off000106d6.bin
449b7da64573d821b88e064014494c5c82179398b8b888fbbe678564c9fa9385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 5680 bytes
font_01_sfnt_off00011a2a.bin
6ed1b989f2719f06cf9a901ab6ddae0d82e09db4a3b75d86ec0f990818705390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 10688 bytes

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