Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b12926b9dc4e25…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 19:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e1f853cdb8217816748484007565d2 SHA-1: 42a0bf24646a7ad7015dd1aaf9c4b1cd871cf72c SHA-256: 05b12926b9dc4e25cbc980313c0d3e61ae32f1f201dcae4595ddbd6aeec59fdd
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with numerous URLs pointing to other PDF documents. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated SEO-optimized links, suggesting a malicious intent to drive traffic to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/wix?keyword=solutions+review+worksheet+key
    • https://cdn.sqhk.co/kagumuzom/dREzeEo/29903002598.pdf
    • http://valigulepi.scienceontheweb.net/chancellor_williams_the_destruction_of_black_civilization.pdf
    • https://cdn.sqhk.co/suxupijisajo/igggghG/ranked_choice_voting_how_many_states.pdf
    • https://cdn.sqhk.co/gebitasixa/ijihjca/46456345136.pdf
    • https://cdn-cms.f-static.net/uploads/4426424/normal_601edb12dc5ca.pdf
    • http://kilewigi.iblogger.org/does_microsoft_have_a_flow_chart_template.pdf
    • https://cdn.sqhk.co/tinupolureg/bhctibz/55682445334.pdf
    • https://cdn.sqhk.co/tinipuded/6DjdXgc/elite_killer_swat_download.pdf
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fceb63f68ab5.pdf
    • http://wipebodu.mypressonline.com/25885393935.pdf
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fd068517dd27.pdf
    • http://pagavopalubutu.scienceontheweb.net/90916492872.pdf
    • https://cdn.sqhk.co/wofikubid/gdmgeia/truck_racing_game_download_for_android_apk.pdf
    • https://cdn.sqhk.co/madagijoj/Ohghfjb/nascar_monster_race_results_today.pdf
    • https://cdn.sqhk.co/jekuzedu/c3jcgde/prank_cartoon_cat_horror_video_call.pdf
    • https://cdn.sqhk.co/busanurutar/aidHiie/tiwarabatamanila.pdf
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5fcfac5b5311e.pdf
    • https://cdn-cms.f-static.net/uploads/4474465/normal_601b15db869c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_4a375166747648d79f27a8714397d647.pdf?index=true
    • http://pavabiza.atwebpages.com/cetoacidosis_diabetica_2020_pediatria.pdf
    • https://721ea522-a1f6-4523-903e-24b3c8014629.filesusr.com/ugd/5a834c_2cebeeb8d4214470b9784fd0de1f150f.pdf?index=true
    • http://zepukedosapiw.rf.gd/behaviour_management_strategies.pdf
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_177a797b23794a2fbb67a8381f199d6d.pdf?index=true
    • http://gujimosodaza.myartsonline.com/dapiditelixarafirudo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc9.bin
23fa14dc57c8354111c8c148dfed4991019d7f0ff1bf5ad13190104008cbdb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 4864 bytes
font_01_sfnt_off0000fc58.bin
80a54ad152c7a5a28fbe7da296b0719d697fbbf2fbc33a15ed967bfb12016cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 10784 bytes
font_02_sfnt_off0001211f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 4324 bytes

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