Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7274c8a10492b3…

MALICIOUS

PDF

74.7 KB Created: 2021-03-12 08:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2e86cc7bc29943d008e6bb996e74d862 SHA-1: 9f888301c26c8d20889ca9801dc0b1150188c65d SHA-256: fb7274c8a10492b3f5d5ed4b632d5f89fdd89038500290810ac4d470422985ea
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains and potentially malicious content, suggesting it acts as a lure. The PDF structure and embedded content are consistent with attempts to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=techniques+d+am%25C3%25A9lioration+continue+en+production+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444655/normal_6023d3e422b7f.pdfIn PDF document text
    • http://mailedflkf.site/bazaputeguzo74jw6.pdfIn PDF document text
    • http://save50it.pro/ryzen_build_guide_2019ayhs0.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/2041421874.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/16481878422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484641/normal_5ff1598e8276e.pdfIn PDF document text
    • http://vrestoran.info/atonement_2007_dual_audiod49rx.pdfIn PDF document text
    • http://womans30planet.com/dixejubumepavigewpvurq.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/hanoi_map_download.pdfIn PDF document text
    • http://qupieasy.online/totemujaxly3il.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_60186900b43b9.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/armitron_digital_watch_set_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463551/normal_6033b2ae1457c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jexusigek.rf.gd/vuvafevabepimom.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/fur_elise_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/duvazaloxadozenalomeg.pdfIn PDF document text
    • http://luwidegudaje.epizy.com/54067186921.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/47576979638.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/defiance_2050_weapon_mods_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/62716756197.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/obtain_police_report_san_francisco.pdfIn PDF document text
    • http://legekiwogitevil.epizy.com/gujikakuganinerawatavem.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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 5612 bytes
SHA-256: 4a4b52cdeeaa6cf7ad574db6fbcb1bbeaa39d9fff60e96baa0ab3d61bee91837
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 10880 bytes
SHA-256: 66329ab92abba456ea4f6c979a731139f03381d5c3c91df4e74bbaa6f3620603

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