Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fbcb8a2873b80b…

MALICIOUS

PDF

82.2 KB Created: 2021-05-14 03:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 78cbfc7d6eb3dc06ddc92900c420eb0c SHA-1: 07b07fdead8694f44b75e0049069f4a412a38912 SHA-256: 39fbcb8a2873b80befb48982ce465820ff035c83809b48c930868f47beef0973
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a link farm and is flagged by a ML classifier as malicious. It also contains an embedded URL that leads to a domain associated with malicious activity. The document body, though heavily obfuscated, suggests a lure related to 'vivint doorbell battery', which is likely a pretext for a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jacksth.ru/strik?utm_term=how+to+replace+vivint+doorbell+battery PDF link annotation
    • http://apsdd54gfv.xyz/guxefijifawafudasiwijzlgw.pdfIn PDF document text
    • http://findssldz.xyz/who_are_considered_gatekeepers_in_the_bibleyui1i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374696/normal_5ffed22d4f48b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5fc962683d56d.pdfIn PDF document text
    • http://verifybadgesbusiness.com/dozibemitaniydd5l.pdfIn PDF document text
    • http://fitnesspack.net/90233998506jsz1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_602f426b3efec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_6049071acb594.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/biwubeleba/dutijajoluwuzizidera.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_05abbc72862a40d4a1998b4003a8b5fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29a98cb-dc72-46cd-b3bc-78c584b56d95/zuzagozoximajakezug.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/acc_aha_guidelines_afib.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/19943307454.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_ade056c8b137420383a5ae6fca302bdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/crowdstrike_holdings_earnings_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/61754188424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e03792-817c-49ae-bd80-2a014589e02d/the_great_depression_us_years_in_the_uk.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_93c6ba5fe3e84e3da036a4e9eb8fc595.pdf?index=trueIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_bf69f61c5efb4ddc9c3849d011724a3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/69912815618.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/83936580774.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/35348911541.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_088293c516a149a59b57a48fd0c18ed9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/nivamupodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a072ee7-9665-4659-a3f7-421adde8f4ae/bivogetavebutawaxevoj.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/d_e_full_form_in_medical.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_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 5244 bytes
SHA-256: b9f272fc7032da306d3a11b3d0cb0d37839f697f0d87b87633cabf2fedf7ff4f
font_01_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10868 bytes
SHA-256: 0355985b8ee4bb94f190e4df9f776d23ca41dfe83286fcc0200515e212add1ea

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