Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89864f0b748dd0c…

MALICIOUS

PDF

67.0 KB Created: 2021-02-21 09:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e6016c353b8bd15105000e3f12c49bce SHA-1: d961450caaf0ba248a5a374d94f497ea8e0afbc9 SHA-256: e89864f0b748dd0cbb26948d0d62b59b53a87b501be021a7994577bcc02c0abe
126 Risk Score

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 0.9998

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=st+augustine+confessions+pdf+download PDF link annotation
    • https://cdn.sqhk.co/kafexobesa/rmgfge3/vetexupi.pdfIn PDF document text
    • https://cdn.sqhk.co/rizanatu/gebgphg/jafitogabalaxididemetapos.pdfIn PDF document text
    • http://chemistryplus.space/paper_mario_color_splash_walkthrough_gamefaqsvrfos.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/cyJQngd/laser_overload_intermediate_25.pdfIn PDF document text
    • http://bluetea.space/walloop_hack_apkn66gu.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/KhhYGU5/big_bang_theory_definition_of_screwed.pdfIn PDF document text
    • http://naturfresh.fun/tukifove6dydk.pdfIn PDF document text
    • http://chambreop.xyz/rojibuboxuximujuwewibdbh6a.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/hiLij8h/sigagoxudadefexa.pdfIn PDF document text
    • http://a-trvl.ru/identify_congruent_angles_worksheetoljyw.pdfIn PDF document text
    • http://prizinsta365.site/amar_chitra_katha_full_collection5px82.pdfIn PDF document text
    • http://bloodcraft.online/lepefevumelt7psj.pdfIn PDF document text
    • http://aduo5.online/kizugezeronatofitemqqy3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/can_chiari_malformation_cause_seizures.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/74828866144.pdfIn PDF document text
    • http://giduzorim.epizy.com/macrumors_buying_guide_macbook_air.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/nimakegisewepupewiziwij.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_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 5420 bytes
SHA-256: 8b6ba5fb095842a55f8da84f58a865a60b9130d4dc3c3ffe887c7694f7161910
font_01_sfnt_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 10696 bytes
SHA-256: 7020c34d3af9a2ed85acab1bc24db1ede04089d39ecac90ead888b7135e7e92b

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