Malicious PDF — malware analysis report

Static analysis result for SHA-256 3906becdd03c108c…

MALICIOUS

PDF

78.5 KB Created: 2021-04-09 00:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bb5c6bdf9fc808c0e4a382a582158faa SHA-1: 04c303466d2caf6c18f7e380cd2f16aca37d73ea SHA-256: 3906becdd03c108c4c2866d82b1b8daabfc6371b78fc1fbad1e5e1b7a25686de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a thermostat issue, likely a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=lux+500+thermostat+buttons+not+working PDF link annotation
    • http://novazeku.mygamesonline.org/affidavit_of_truth_template.pdfIn PDF document text
    • http://lovasosirukes.iblogger.org/21964148903.pdfIn PDF document text
    • https://dijajogid.weebly.com/uploads/1/3/0/8/130874349/gumobitopajaf.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/zezafiruxonokeb.pdfIn PDF document text
    • http://jagivex.22web.org/how_much_oil_does_a_2009_corolla_take.pdfIn PDF document text
    • https://mefirotevi.weebly.com/uploads/1/3/5/3/135314773/nikoti.pdfIn PDF document text
    • http://narawodosure.medianewsonline.com/bufugatexexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_606e7d8a7e638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_6040363c4de81.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/75980299489.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/juwuvaxefopenapejumapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozinidusekoz.epizy.com/tipe_budaya_organisasi.pdfIn PDF document text
    • http://vumovofun.onlinewebshop.net/xujoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d2bb80-69d8-4c8b-90fe-396be6256f85/50074686402.pdfIn PDF document text
    • http://memaded.epizy.com/barbie_doll_cartoon_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11e95ff-d45c-4e90-a47e-1bcb54447987/55912196343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d85b60b-90fc-47d9-ab19-814f8c0f0252/xomumaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f945e92c-3f53-49e2-893a-29cbe11153e2/momasufasesoxezepuduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938f1f1d-3e04-4e54-b586-40f10c6a7f47/tatewe.pdfIn 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_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 5640 bytes
SHA-256: d16f2b0419e0062ba39ff370770d2f462501b25b3c00d710016521192543ab02
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10432 bytes
SHA-256: 2de18c5931e651ea79b966104a61d9cdf1a1efde7bfd04ca15b203709a1ee612

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