Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c3ac273a4b4fd4…

MALICIOUS

PDF

81.3 KB Created: 2021-03-12 22:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 20f019ce2acfca8aa7c345dfab922f07 SHA-1: 5bb828704f651c2e906e974614b53d1dab14712e SHA-256: b8c3ac273a4b4fd4cbc17ab788d5d7c534334fcc84f6b6587aa1f6b702ae8609
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=exponential+growth+and+decay+worksheet+algebra PDF link annotation
    • https://komidozikozapuf.weebly.com/uploads/1/3/1/4/131455883/pivukumubawuru_befope_gafexujijami_sasoka.pdfIn PDF document text
    • https://medijoju.weebly.com/uploads/1/3/1/4/131452922/d20bac6c16.pdfIn PDF document text
    • http://julubavixukab.66ghz.com/everstart_3_amp_smart_charger_manual.pdfIn PDF document text
    • http://trickyturkey.com/dymo_label_maker_reviewsvlzin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5fd98a4a7cd43.pdfIn PDF document text
    • http://mx50off.pro/83596742362hqnso.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/259326.pdfIn PDF document text
    • http://starkrobotics.org/22955413503m6qh1.pdfIn PDF document text
    • https://mavulirapiba.weebly.com/uploads/1/3/4/7/134741644/kuzonuz_birixix_loripiwaki.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/f6e9bf83773.pdfIn PDF document text
    • http://dapabikokewe.iblogger.org/singer_sewing_skills_reference_book.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/fimotapefijaju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fefb1c8dab7e.pdfIn PDF document text
    • http://autolombardpro.ru/38289261007qdaaf.pdfIn PDF document text
    • http://vnds-v.website/how_to_use_a_pulse_oximeter_correctlyytwbf.pdfIn PDF document text
    • https://tabureribe.weebly.com/uploads/1/3/0/8/130813037/7574232.pdfIn PDF document text
    • http://lovelyhouse.online/segegapixekizupoawrwu.pdfIn PDF document text
    • http://gouliwer.online/tatufuruvajelu0qt73.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://wivowutone.epizy.com/what_bats_are_legal_for_high_school_softball.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/finimaditoguginutuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5548 bytes
SHA-256: 2fec40de2b770b9e463a589516e6f7e4a020e63cf6f23079169175656ac23481
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 15528 bytes
SHA-256: e5d269358a6178a4bf01e8d8d2f9fe82c3e52331cf02519fc765e50d509c8a5b
font_02_sfnt_off000129ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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