Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cf927f1dd0cf38…

MALICIOUS

PDF

66.4 KB Created: 2021-02-11 19:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 542e142bc0eade0d2f5f4c5c56a42a8a SHA-1: da36ee773bd66e69e4f3ae323d46f8ca583452b2 SHA-256: 17cf927f1dd0cf38c869eb1c1fbf8daacb18968ba7e369868079804c7ff14fdc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, indicating it functions as a link farm designed to redirect users to potentially malicious websites. The primary URL observed is https://seumenha.ru/wix?keyword=ap+biology+030+advanced+genetics+video+review+sheet+answers, which is likely part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=ap+biology+030+advanced+genetics+video+review+sheet+answers PDF link annotation
    • https://cdn.sqhk.co/raxoxawupej/jehbhij/5496139376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_60107e6b558fc.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/7948740.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/haie2e2/online_marketing_classes_in_velachery.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/cejhZpy/game_sakura_school_simulator_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fe7eb1934906.pdfIn PDF document text
    • https://javisifuwo.weebly.com/uploads/1/3/5/3/135304639/nubeveto_tirajudelaboxet_vejoromu_difavelimaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5fdbd11d34b89.pdfIn PDF document text
    • https://piguvedulo.weebly.com/uploads/1/3/4/7/134724556/mogeruxunaxenokid.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/Ljahcjg/sleep_cycle_sleep_analysis_smart_alarm_clock.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/gejeu2y/87854563410.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/b22ec4de0c7227a.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/ntRUIie/vixokuvoleni.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/igBlphD/cooking_fever_gems_2020.pdfIn PDF document text
    • https://tutowori.weebly.com/uploads/1/3/5/3/135317166/tukixatugokilapone.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/idiiOYN/universal_studios_rides_open_during_halloween_horror_nights.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/gdsjfid/woboxepovunevivulatak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fe56ea31f493.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 6024 bytes
SHA-256: f94ffccfef0e8b96626df827eea7be17e2b5ea6f56b9e6d194477146884bbf0d
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 9968 bytes
SHA-256: dbc74efcccce4d8ddce030475db4ada1ca07937181d2cdd845536136fad5929e

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