Malicious PDF — malware analysis report

Static analysis result for SHA-256 57347850d3ddc839…

MALICIOUS

PDF

74.7 KB Created: 2021-02-04 06:16:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a96addecd8cecb43fcb0ddfa6d7dc072 SHA-1: f7fb7a0ba05db72a5757c36e69284b48dc1e4cfb SHA-256: 57347850d3ddc8390abe4168e89d2f3fb6aa0747283f407941155f172a13cb2d
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-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://jottigo.ru/aws?utm_term=gawat+janin+fetal+distress+pdf PDF link annotation
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/wutarujovuborelo.pdfIn PDF document text
    • http://specialsale.info/sagusiradidokonenua0n7p.pdfIn PDF document text
    • http://copalofa.site/fisiologia_del_aparato_locomotorq7652.pdfIn PDF document text
    • http://gonzo-3d.com/mister_roberts_full_movie_online_freepah7j.pdfIn PDF document text
    • http://avbox.org/281046772523mj3g.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/muketesode-mitudigo.pdfIn PDF document text
    • http://titoto.xyz/collagenase_ointment_davis0t478.pdfIn PDF document text
    • http://megantv.site/pj_masks_hero_academy_game1xqgk.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/xatunegoleteluse.pdfIn PDF document text
    • https://fobizolavavoka.weebly.com/uploads/1/3/1/4/131406440/b2839e74b9b9.pdfIn PDF document text
    • http://gaydating.world/tiwevinigarozf3uq.pdfIn PDF document text
    • http://fsfsfd.xyz/long_underwear_onesieemmif.pdfIn PDF document text
    • http://4gusevshop.space/st_regis_mohawk_tribe_enrollmentk1e8i.pdfIn PDF document text
    • http://ingmijn.com/2930915709922x1s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonozud.rf.gd/12049915139.pdfIn PDF document text
    • http://nodimetonakijeb.epizy.com/sosazakujifakafogisutud.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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5232 bytes
SHA-256: 06786baf2e2141619351b8f4c176c3d4ae002179e4efdcb36d90cbbd369d53a9
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 10104 bytes
SHA-256: caf54971f05ad28c6bf73811cf16d68654a2f4314c014523a6a9fed42fcd0a4f