Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7c2c4857004efb…

MALICIOUS

PDF

88.3 KB Created: 2021-03-05 12:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a3928c9b7a9ef170d8352a4ff31e06e0 SHA-1: c2583f1ca7e799039ec7e1af4a63268475954370 SHA-256: bd7c2c4857004efbe30095cc816e13198f96a26e119dff5940be511d10069a07
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'fokemale.ru', suggesting a phishing or scam lure disguised as information about sewing machine parts. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the classification as a malicious document designed to redirect users to external, potentially harmful, sites.

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
  • 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://fokemale.ru/award?keyword=singer+sewing+machine+model+4572+parts PDF link annotation
    • http://duzusedolatepe.mypressonline.com/iso_9001_certified_meaning.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/lalitoxeb2ow.pdfIn PDF document text
    • http://rixugogalide.22web.org/64573473105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_60275edd20f76.pdfIn PDF document text
    • http://itverys.space/idioms_worksheets_3rd_gradew1wp5.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/panasonic_cordless_phones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60250daf892b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_6010eec31a5b4.pdfIn PDF document text
    • http://mkuu.club/280421201812xef0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5ff2cb4f322dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_6015857284a52.pdfIn PDF document text
    • http://brosbass.com/fur_elise_jazz_version_sheet_musichmxjo.pdfIn PDF document text
    • http://korecos.ru/effective_java_by_joshua_bloch_freee1s3z.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/jupoti/tixopexevuxomulo.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/after_twenty_years_by_o_henry_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/jokagijatawejew.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_6ad18fbaee4f46ed8c0c6401f09275d5.pdf?index=trueIn PDF document text
    • http://dafukip.myartsonline.com/best_managed_wordpress_hosting_site.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/jefowaxaduvotawavewufisej.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_009bbccccc274d5d81494347c57839ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/air_force_portal_cac_login_mac.pdfIn PDF document text
    • http://jovurafop.epizy.com/kavubofobotogas.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_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 6104 bytes
SHA-256: b860e7d7a84f09d9d6f4982224c79bf20aadbbcc3242481b460be22f83baf461
font_01_sfnt_off00013015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13015 10476 bytes
SHA-256: e878a0cc592cb99794a5fe0c147f1496bf05a818954f15731943722a140715be

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