Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93f152c201b7ded…

MALICIOUS

PDF

71.1 KB Created: 2021-02-22 20:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e543753945a58ef4f4b43179ec9b9726 SHA-1: 0e0839c21088ebb829d9b3ab9895757ff21fafee SHA-256: e93f152c201b7ded9cde252b4068c268c2f67e61808b141993dce7b8eb904fa5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a 'general release of claims form', indicating a social engineering lure.

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://jacksth.ru/123?utm_term=general+release+of+all+claims+form+word PDF link annotation
    • https://cdn.sqhk.co/pomiziluda/1lsiYjc/old_man_s_journey_apk_free_download.pdfIn PDF document text
    • http://tameenegypt.com/corporate_minute_book_template_alberta1ah3p.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/9847894.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/serutuvi.pdfIn PDF document text
    • http://acupofjacob.com/math_giraffe_slope_intercept_form_answersvebuw.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/gg9ghhe/mcdonald_s_covid_hours_uk.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/8480827.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hew82gi/gridtm_autosport_mod.pdfIn PDF document text
    • http://table-wait.com/safety_equipment_on_boardufjjg.pdfIn PDF document text
    • http://blockingscenery.com/calas_of_calan_gamesurgyi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fda0a8d6742e.pdfIn PDF document text
    • http://romeita.space/pejisowegoxomwsspr.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/vBfjeif/zotejabojozejoduwiri.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/9516637.pdfIn PDF document text
    • https://tegipogelow.weebly.com/uploads/1/3/1/4/131407588/betapewuma_zepurijov_serogogeg.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/meloxadok_petekevuragik.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/xupovobejanam/17883860322.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/silicon_valley_season_5_episode_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/how_to_overcome_zero_gravity.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/guxatolar.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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 5288 bytes
SHA-256: b023e8c3a7527ee0fca57eac610c3449f1ae7090c0699a1a747dd5882fa56b14
font_01_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 10320 bytes
SHA-256: d8c3faf0c8d0e69eab619e43121d7d6d02d9b2322ea8654be99e780d37adcd71

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