Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ba201406163228…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 14:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 36dea3c9056e4a60bd7b444f7993c480 SHA-1: 2517e7079f9729e4eb78dfc37576bb2836eedd57 SHA-256: 42ba2014061632285100d0f8c9cba0201ac8aabaf2f2a96695480db8bb516c88
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 suspicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=whirlpool+front+load+washer+and+dryer+set+-+wfw8620hc+wed8620hc PDF link annotation
    • http://tilikef.mygamesonline.org/fejezogosuribuzivasiv.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/how_well_do_saltless_water_softeners_work.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5ff9a5c4d3408.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/406800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fd7956ac7da4.pdfIn PDF document text
    • https://zazivepug.weebly.com/uploads/1/3/4/3/134359823/gasuri_nomitudoji.pdfIn PDF document text
    • http://sibobovogulumu.22web.org/what_bible_says_about_cheating_husband.pdfIn PDF document text
    • http://nositadox.mypressonline.com/onkyo_tx-nr636_atmos_speaker_setup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kubafezin/sojikufosibe.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/earth_s_rotation_worksheet.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_b96e43841bba400daadc6ac4f6963cbb.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_b8c54fb928ff4b1881ee6a26308dc3ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/15989099263.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/fetiniramejuz.pdfIn PDF document text
    • http://vogumogut.epizy.com/57978837399.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_ee36f1f5d92e47deb2946d9408c59023.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dujepav/muraramemidegi.pdfIn PDF document text
    • http://pikejip.rf.gd/63164761278.pdfIn PDF document text
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_42d0d4f4b35b4985a402403aaaab979c.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 6104 bytes
SHA-256: 13d5d74c6b91e036b0245ebe12b7edd58331c42891d004e04a641f3a0d04f00d
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10540 bytes
SHA-256: 4d76f08632907d3f8f2333666cf1e4b4b700a41ac0c00b0f987398f856aa3d0b

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