Malicious PDF — malware analysis report

Static analysis result for SHA-256 1875707d7d17401f…

MALICIOUS

PDF

74.5 KB Created: 2021-02-16 18:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a50f442348d2679be8cb1340d14a0199 SHA-1: ac98e2d5529e406685cda499e3cc804e58ed325c SHA-256: 1875707d7d17401f778c595d3eb32c65d6492b016c451599c24a57db2b917d7e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure related to 'Z97 motherboard cpu compatibility' and a high-confidence heuristic indicates it's a phishing attempt using an SEO redirector. The primary malicious URL identified is https://jacksth.ru/strik?utm_term=z97+motherboard+cpu+compatibility, which is likely used to redirect the user to a malicious site. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jacksth.ru/strik?utm_term=z97+motherboard+cpu+compatibility PDF link annotation
    • http://italiabeach.space/dungeons_and_dragons_sword_coast_adventurers_guide3brnp.pdfIn PDF document text
    • http://xomapometafa.iblogger.org/lagu_senorita_free_stafaband.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/gz8hfgh/26591863991.pdfIn PDF document text
    • http://shoop-fp.ru/11337083500i1hs1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_602a9f16dc083.pdfIn PDF document text
    • http://tryplafond.xyz/babu_bangaram_ringtones43byg.pdfIn PDF document text
    • http://indonesia2health.online/adverb_of_time_place_and_manner_worksheetsbs2dk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_600bbcd4c032c.pdfIn PDF document text
    • http://zathkatow.xyz/advantages_and_disadvantages_of_multilingualismkndpt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lojokedasu.rf.gd/99106581560.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/food_bioconversion.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/calcul_chute_de_tension_formule.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/piano_sheet_music_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/legumes_nuts_and_seeds_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/13459483872.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/suvimavota.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/tab_dividers_for_sheet_protectors.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/rosesivakanezogibedut.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/zuwofemanowogusepami.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 3016 bytes
SHA-256: 6b1886100909a5777bb30fc7b7be00bba8ed48ad5f5b392b7a0cb4783a0739ac
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 5348 bytes
SHA-256: b2db1e0e95dfac80d51753022bd59bd07bbc7b49e80a9654bd488eb4def6cd80
font_02_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 10580 bytes
SHA-256: 03744997651f2cbf6308e7a8b7c1b38f52d19dedf700bc2cf16aa6875ff8ab11
font_03_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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