Malicious PDF — malware analysis report

Static analysis result for SHA-256 8997331cb4ed105b…

MALICIOUS

PDF

69.0 KB Created: 2021-03-10 06:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ca6d966b10d651ccaf3cdb31852dd49 SHA-1: 73c885d177a7e6678abaf28dd421ca130e154444 SHA-256: 8997331cb4ed105b9b769163ff028de74c6e30abecbcd7a956af6b4b988b944e
156 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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to product searches, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=filson+alaskan+guide+shirt+reddit
    • http://kolagozisil.mywebcommunity.org/29432983213.pdf
    • http://rupasuwejex.22web.org/kexejijufi.pdf
    • https://cdn-cms.f-static.net/uploads/4423696/normal_602babf6c794f.pdf
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/6139756.pdf
    • http://govuxojikasumot.scienceontheweb.net/how_to_calculate_preference_dividend.pdf
    • https://cdn-cms.f-static.net/uploads/4471109/normal_601a40bae9df1.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_5fd78b1591068.pdf
    • https://subogepaweb.weebly.com/uploads/1/3/2/3/132302814/nufefojubako.pdf
    • http://budofibo.mygamesonline.org/java_swing_gui_programming.pdf
    • https://rakiletapaleta.weebly.com/uploads/1/3/1/8/131856645/zefurofava_rimev_tedobajujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_c436ca37ba814e41ba47b78193d6a73a.pdf?index=true
    • http://dakafatuvuguviz.atwebpages.com/how_to_train_your_dragon_2_villains_wiki.pdf
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_14cb18ed21c64d6885b534906ba87990.pdf?index=true
    • http://ledufowi.myartsonline.com/beachbody_ultimate_reset_nutrition_guide.pdf
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_424c7f24f65c45df99565d154f57130d.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_c0a003060ed54be4a6056fd73c67cd30.pdf?index=true
    • https://s3.amazonaws.com/ladojenefe/tazewatotum.pdf
    • https://s3.amazonaws.com/bededuxotulapil/ielts_reading_test_3_answers.pdf
    • http://wuzuranajinimuv.rf.gd/briggs_and_stratton_vanguard_16_hp_vertical_engine_oil_capacity.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_off0000d244.bin
e116e0fe33812b0d31f39dc60ed385cab295cf0025fda485b0fe32fb99a150ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 5108 bytes
font_01_sfnt_off0000e39b.bin
8562eb5444f119adf4515bdc2f835d8c228111b63488065028ee6052332ecfe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 10196 bytes

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