Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d16a7e6dd4cbc6…

MALICIOUS

PDF

74.9 KB Created: 2021-04-01 14:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 293d2791381a8e82880d6c48040bd5d2 SHA-1: b85d91d87f40510c96c75c725335535a08964f4c SHA-256: c2d16a7e6dd4cbc6ebf3e006dc5a50bdc474eeeb4eb645446a5559c30d72b5a5
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-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://seumenha.ru/wix?keyword=asl+numbers+1-20+printable PDF link annotation
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/5994854.pdfIn PDF document text
    • http://help-service-support.com/natedesuruzuvakepodoygnhl.pdfIn PDF document text
    • http://fitokapss.xyz/xoloxoponewewuvogabexgx0n.pdfIn PDF document text
    • http://lianhua.life/lunarutoxivaledadobegitu2pzw4.pdfIn PDF document text
    • http://nekevofitoruzat.22web.org/classroom_language_english.pdfIn PDF document text
    • http://demubowigipuwi.22web.org/mitavuvefozafadumukuliga.pdfIn PDF document text
    • https://vegimeva.weebly.com/uploads/1/3/1/3/131380995/rujasiwidipepuz.pdfIn PDF document text
    • https://vezudarelewik.weebly.com/uploads/1/3/1/4/131482962/xajedifuxegunuwafifu.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/36ea8db1.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/102164f444a.pdfIn PDF document text
    • http://detonicufficiale.website/6135017247gw8ps.pdfIn PDF document text
    • https://niwonuruvi.weebly.com/uploads/1/3/4/7/134767359/deboger-muris.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/1441006.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/aa48f1.pdfIn PDF document text
    • http://dressnbuy.com/wutimozaketafene7uk.pdfIn PDF document text
    • https://gefawopunov.weebly.com/uploads/1/3/0/9/130969454/mamumuw.pdfIn PDF document text
    • http://begetus11ppz.xyz/7473442362nxsq5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e39a9d-d94c-47f3-82a4-d4715851b144/75073543643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba411ea-57e1-4fa3-8c65-ad5201ad837e/jejomalogifokorurusugap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50279b30-e8c7-42ec-aed0-fc1bec2074d5/garavusidu.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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 5452 bytes
SHA-256: f1d2b3706acc2ca703036e7ea147f0272ebb79fc78903ba8e816c0d258941e62
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 10260 bytes
SHA-256: a63e3f153238cb287a8695aabea48fd74d4adafe0207e19f0a30190ffc6d9b13

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