Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3332743407c0c3c…

MALICIOUS

PDF

155.6 KB Created: 2021-03-03 12:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fbf8157d5b5f62f9416202cb08da83b1 SHA-1: 22b42294df914a540af0d3af32e8f332d398c907 SHA-256: e3332743407c0c3cca128e5ac3ca91749889473dd8bd6a6b763c5d068756ee31
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, with a primary external URI leading to 'gimoguvi.ru'. The document body, though heavily obfuscated, suggests a lure related to 'alchemy'. The presence of multiple external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gimoguvi.ru/123?utm_term=what+is+alchemy+all+about PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377095/normal_60315cc8c8d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_602c371e42a72.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/giYhhhg/30237382313.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/scientific_article_format_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/mEHjjgh/repig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_601b8a9bb8547.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/iibx1ic/jesasekelolokewavogexo.pdfIn PDF document text
    • http://penageli.getenjoyment.net/what_to_do_if_your_washer_will_not_spin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_6023151f1eb71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_5fd9f20fe851e.pdfIn PDF document text
    • http://reveruverof.medianewsonline.com/11951026244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fca7f7f0f41d.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/gasopebol.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/muxogijexuvufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411919/normal_6005de27867bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bazejufojowopor.epizy.com/what_are_the_benefits_of_yoga_mudra.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/simedivas.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/dugaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/51308679236.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/34737918622.pdfIn PDF document text
    • http://dimogotewebi.epizy.com/fukinuzosilowuwekevulew.pdfIn PDF document text
    • http://lozisuvuxinosog.epizy.com/ruvemofuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/37741919372.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20094 5200 bytes
SHA-256: 7c083acce7370edb804690a0b67d3959a11d9875a4a2a85bd2108482073b4d00
font_01_sfnt_off00021231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21231 18352 bytes
SHA-256: 02b4983a41758b639a2ceaa15633802c6fae35ced6a4bab17fe5dfdfcac856a0
font_02_sfnt_off0002472e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2472E 17032 bytes
SHA-256: c784ad163c8e8714f637b24aabf797979b888a9d5c9b211f0273ba3ec1ef1858

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