Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc72497dd4571395…

MALICIOUS

PDF

68.9 KB Created: 2021-03-15 03:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 176be3d325a30118192bea37ae5f5e6c SHA-1: d017010f31be8b83301a47ec62e51080a6556255 SHA-256: dc72497dd4571395758e66ced2fb08b753c14053ff2068f7d5635415dcc6f677
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious Weebly and other free hosting domains, indicative of a link farm or distribution network. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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://kuzutuzo.ru/wix?keyword=graphing+exponential+functions+answer+key
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/429f4a69804e47.pdf
    • http://kikifikoxije.mypressonline.com/100_ideas_that_changed_graphic_design_2012.pdf
    • https://namadifudemabum.weebly.com/uploads/1/3/0/8/130813063/vinaferuba.pdf
    • https://gumosoxegobekij.weebly.com/uploads/1/3/3/9/133999275/dudezu-morinuwabi.pdf
    • http://fanuvazav.scienceontheweb.net/ballade_pour_adeline_guitar_tab.pdf
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/wiwefalenejovaxut.pdf
    • https://kijemaroxajum.weebly.com/uploads/1/3/5/3/135397629/sewinijo.pdf
    • http://ridovise.sportsontheweb.net/safety_not_guaranteed_scene.pdf
    • http://nesarose.sportsontheweb.net/apps_to_annotates_on_ipad.pdf
    • http://xukosususif.medianewsonline.com/37885060925.pdf
    • http://rovanenafet.getenjoyment.net/wuxulosalug.pdf
    • http://dorulezebum.sportsontheweb.net/plantronics_voyager_legend_pairing_with_phone.pdf
    • https://xegilebul.weebly.com/uploads/1/3/4/3/134347284/8644651.pdf
    • https://mawubisevidezo.weebly.com/uploads/1/3/4/4/134480432/7348503.pdf
    • http://sijemogezabusa.sportsontheweb.net/arduino_language_reference.pdf
    • http://tuvivukaroj.mygamesonline.org/brother_pt-h100_label_maker.pdf
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/nematarikotop.pdf
    • https://menavexijipiges.weebly.com/uploads/1/3/4/5/134599349/218a46cb26863d.pdf
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/jowopuvopan.pdf
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/jijodapile-ginemaloja-kutezi-kupenu.pdf
    • https://daxuvinu.weebly.com/uploads/1/3/2/6/132695190/6776099.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/57dab846-1840-42c3-a5ac-41e5c7f8a42f/ralph_waldo_emerson_essay_self_reliance.pdf
    • https://uploads.strikinglycdn.com/files/7fa4f7dc-60ac-4c86-96a9-580b0df60260/pretty_little_liars_season_3_episode_16.pdf
    • https://uploads.strikinglycdn.com/files/9bd0d4f3-3a4e-4d14-9f7a-7c228e48d4c0/how_much_can_a_2013_dodge_ram_1500_5.7_hemi_tow.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_off0000d0a4.bin
80a61913fc5cab0b89eec14b70af946075ee31552543210264c19f4b38f56ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 5632 bytes
font_01_sfnt_off0000e3f1.bin
6fe60987fdfd74a98cb188a8ae8d284bef74b17bd28d13b902aebb5512a97527		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 9896 bytes

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