Malicious PDF — malware analysis report

Static analysis result for SHA-256 755371197e408d26…

MALICIOUS

PDF

71.5 KB Created: 2021-02-07 00:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3a74a81a540198de3ca18609b5707f71 SHA-1: 024cde6f4d00dc59ddeeac2ac0232face7ee15ab SHA-256: 755371197e408d26977258d9f6020a0b958f72fc3bddfcc693f3daf9cac818da
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://jacksth.ru/123?utm_term=hamilton+in+baltimore+reviews PDF link annotation
    • http://raicen.com/5378515907202oh2.pdfIn PDF document text
    • http://afracheat9.xyz/los_reformadores_protestantesq276b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_60162594cdf25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_601f1963120ff.pdfIn PDF document text
    • http://nudevego.iblogger.org/repokuz.pdfIn PDF document text
    • http://xapakemulu.22web.org/jigig.pdfIn PDF document text
    • http://flathead.us/up_election_voter_list_20172do7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388818/normal_5ff804e37f2a1.pdfIn PDF document text
    • http://pizidojokinesa.66ghz.com/90631692312.pdfIn PDF document text
    • http://nosofave.iblogger.org/kuruvejud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujafosedoke.epizy.com/acacia_auriculiformis_dmt.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/best_bingo_apps_for_android.pdfIn PDF document text
    • http://kepinud.rf.gd/sherawali_mata_ji_ki_aarti.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/dream_on_aerosmith_song_free.pdfIn PDF document text
    • http://busilumun.rf.gd/todos_os_evangelhos_apcrifos.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/false_water_cobra_care_sheet.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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 5084 bytes
SHA-256: d9087d4b8653cb14991b0d542acde90e4531c289468253320c8d0d6ad0b6b82b
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 10968 bytes
SHA-256: 8900bbd2ac011e332c1f0fc595ca9d69f1faca6292d2ddd9dd397d2cc9fb8080

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