Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c72af49a4ecdde…

MALICIOUS

PDF

81.8 KB Created: 2021-04-23 09:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 85f24878a834df9c6d1c636b83e33e4f SHA-1: 550c3132dbd00761c15bb0dd56712f47ebea50f9 SHA-256: 17c72af49a4ecdde1e2030ef31aaffad882a07bafec75903fa083cb1902e4b5a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=kenmore+ice+maker+not+working+red+light+blinking PDF link annotation
    • http://tipofeliluget.medianewsonline.com/97585078516.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/7791586.pdfIn PDF document text
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/69bf118.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/zuperopegusoxatalejati.pdfIn PDF document text
    • https://tomigure.weebly.com/uploads/1/3/4/5/134508439/8478d0323b2a53.pdfIn PDF document text
    • https://lobakazuperowe.weebly.com/uploads/1/3/4/3/134352895/46f16.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/jajite.pdfIn PDF document text
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/1221681.pdfIn PDF document text
    • https://nebikaxo.weebly.com/uploads/1/3/4/6/134655772/mojeviwuwogufozer.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/8883775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejaxuka.epizy.com/nabubetizix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d631ecb5-2140-46d9-92ea-b8c2b374fa50/star_trek_the_next_generation_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/93566361422.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/bird_of_prey_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648c1e17-4875-43b7-9bee-853f4b24598c/gakepizezigevewuxejux.pdfIn PDF document text
    • http://rifoxofome.rf.gd/fumebazewajuto.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/zazini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bc89d9-2d24-4a6f-8990-89b95eaf1b2a/how_to_change_time_on_automatic_watch.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/maths_practice_worksheets_for_class_5.pdfIn PDF document text
    • http://tawojijil.rf.gd/xovukekurirefukegololem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45139ff-25aa-4fb9-b804-9b48dcb84f8d/35925445264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ea025c-e2d5-4f76-b9d1-69360a31957d/sunujizam.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/saxuzo.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_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 5440 bytes
SHA-256: 7ea6d54535b68d2171e84e876f5c480ef4cf4e22cd405fa448af8066236348f0
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 11096 bytes
SHA-256: fb44abd3a873d9400a0dd41f59bcc0e42b3d91b9298794c61dc5e9ae14271482

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