Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1084f7081220ff3…

MALICIOUS

PDF

88.0 KB Created: 2021-02-28 00:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2b3d8af756c40c863606a591f1a1225b SHA-1: 86cf26670156fdfc00ded24d9ae13541e075435d SHA-256: b1084f7081220ff3b272a3bdc4567a835e905f2c6314c77e1e31141d21ff002a
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable 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 a keyword search phrase, likely a lure to encourage clicking the embedded malicious URL.

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 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://nipisod.ru/award?keyword=is+the+mandalorian+weekly PDF link annotation
    • http://kojazunupetip.mygamesonline.org/tadamijobalavezemobufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5ffdc83c252ea.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/bejaweg.pdfIn PDF document text
    • http://pravagims.net/73963458207lnl6o.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/sewodotudunurefidale.pdfIn PDF document text
    • http://copyright-supporthelp.com/pioneer_mixtrax_fh-x700bty0ok6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_6013f14f7e94a.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/acts_of_paul_and_thecla.pdfIn PDF document text
    • http://mebelintera.ru/nazezvcpwz.pdfIn PDF document text
    • http://tovelksa.website/polk_magnifi_max_sr_review_cnetc7y71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372696/normal_6004e3d66ac8c.pdfIn PDF document text
    • http://kawlites.online/88278459889w0r5q.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/hp_photosmart_7515_printhead.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/91184647570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigirulame.epizy.com/14088511631.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/al_quran_shikkha_bangla.pdfIn PDF document text
    • http://gafodix.myartsonline.com/silence_of_the_lambs_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/puzivuponifusosel.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/sex_education_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/matugigobakebawino.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_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 5260 bytes
SHA-256: 990c8f047d8fd59b79a5c30946e09b82b16dcbaf7467719ab34abc24c4fb6bd1
font_01_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 10212 bytes
SHA-256: c217a006754dd019394ca9d81f92d3a1e62dc3929a6c4a3ce5099a32f861a8f9

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