Malicious PDF — malware analysis report

Static analysis result for SHA-256 92558d468c210149…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 14:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9f2fedc3957480dd63bdc4e3ea3edaa9 SHA-1: aea2dcd41cd359754fff42f06e2456951593fb68 SHA-256: 92558d468c21014906ba824ad11a03dc29c609ce1dc752c11af466babf1014ed
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing lures. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a high volume of links pointing to redirectors, with one prominent URL being https://jottigo.ru/award?keyword=dictionary+english+to+russian+pdf. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/award?keyword=dictionary+english+to+russian+pdf PDF link annotation
    • https://kusumuwuwudes.weebly.com/uploads/1/3/4/3/134338751/kepeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fed09fce35d3.pdfIn PDF document text
    • https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/jejobovakofegupe.pdfIn PDF document text
    • http://numulul.mygamesonline.org/why_is_the_fridge_leaking_water_inside_it.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/wadepifakerupu_fazejegesap_pupanizixugijip.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/dujinufeduten-rofugurewuja-darapuzi-kevebe.pdfIn PDF document text
    • https://wodekatim.weebly.com/uploads/1/3/1/4/131405934/dexemigamevosasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_602a277974da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_60332cccb0770.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/how_to_write_a_professional_resume_canada.pdfIn PDF document text
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/bigalepobok.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/tigavexenez.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/7370650.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/ccna_practice_labs_packet_tracer.pdfIn PDF document text
    • https://ketijumorowifop.weebly.com/uploads/1/3/2/6/132682879/dusuwetufel.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/febopa/92478839570.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/wrong_turn_5_tamil_dubbed_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/86573885092.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/44706342483.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/63255154394.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/zavekinananibuboganatiru.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/astrology_chart_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/bhaigiri_trance_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/pimibafopedik.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/cool_jazz_font_for_android_mobile.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/best_spirit_blossom_ahri_chroma.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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 5516 bytes
SHA-256: 90c791463b75c43ee813fd6fcace8dd75c6d8174abb769b85aa25de531b1b699
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 11388 bytes
SHA-256: 0065a2e029bacc99032c5d6731d750fe4e81654a71ac6f40069a4e6e0319b7a1