Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8b3e40cbede622…

MALICIOUS

PDF

79.7 KB Created: 2021-05-14 08:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f4b8b3cdc934e7f6ccbc0ab6dd0496b4 SHA-1: de443f68eb361800c465390e876b9f9bd28bd2f3 SHA-256: ad8b3e40cbede622aa4184abfd4dd34757ea4baf8f4e8577cf8b4af0a919be33
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 0.9991

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://pelibifir.ru/strik?utm_term=texas+instruments+ti-83+plus+graphing+calculator+instructions PDF link annotation
    • http://andyhong.blog/72850555173kq4m3.pdfIn PDF document text
    • http://sedouche.xyz/711598723689qn58.pdfIn PDF document text
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/2f8062994d9a9f.pdfIn PDF document text
    • http://useplafond.xyz/xowopogekegaferijamajaw1go1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5fcdfd6af0da8.pdfIn PDF document text
    • http://greenbike.shop/belbin_test_downloadj2ise.pdfIn PDF document text
    • http://gloslides.com/2860112674tbh0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_6025c465bb8cf.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/iHAgfic/34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401971/normal_5fff7ed991c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_602e41f07955b.pdfIn PDF document text
    • https://cdn.sqhk.co/wejemabip/3BjeA2K/nakawajejikapew.pdfIn PDF document text
    • http://kenuzerelo.22web.org/nareref.pdfIn PDF document text
    • https://cdn.sqhk.co/kewexezaviz/QORxgel/mebekefodoxutedozewozaf.pdfIn PDF document text
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/d63290b9fae5.pdfIn PDF document text
    • http://bowenaf.22web.org/hoover_windtunnel_vacuum_cleaner_manual.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/2387315.pdfIn PDF document text
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/porexodo_rerepavizid_kojezebog_giweg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_606d39a703e61.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/mifcomc/91991061741.pdfIn PDF document text
    • https://pajixuga.weebly.com/uploads/1/3/2/3/132303126/dosafuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visobiwedixupip.rf.gd/97776834580.pdfIn PDF document text
    • http://rewifavad.epizy.com/30987300285.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/wonaguluviwiraluxefotija.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_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 5752 bytes
SHA-256: bafe8401a037a13387f010b38f7398d5117983ea28c3824714ea16ae0c3d4279
font_01_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 12568 bytes
SHA-256: 49e77ddd0caff08cfec0ec484fa2be01660c7b47b01b5d7dd7a01ad8b944e784

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