Malicious PDF — malware analysis report

Static analysis result for SHA-256 139eb978d90447be…

MALICIOUS

PDF

77.3 KB Created: 2021-02-25 13:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 75a3af5e5b351db89dd2d94b72f255ae SHA-1: ce1423345b20093ad88d46c7ec42342bf80f15b7 SHA-256: 139eb978d90447beb03cf9dd4826454c0c53deea12b4ef2701be8c641c459a27
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains links to known malicious redirectors and disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'transcript test answers' and urgency, aligning with a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/wix?keyword=go+transcript+test+answers In PDF document text
    • http://stassikorskyi.com/43080825788fkogj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5ff77009c62c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_601ed997e1489.pdfIn PDF document text
    • http://akvatehnika74.ru/home_theater_switch_boxfm4kc.pdfIn PDF document text
    • http://requiredjokblog.com/72164848393vdbya.pdfIn PDF document text
    • http://crispyset.online/4_pics_1_word_level_2888_answerscasu.pdfIn PDF document text
    • http://visiblawty.com/craftsman_25cc_gas_blower_pull_cord_replacementkvvyv.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/sukeborobod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_600e7a919fb4c.pdfIn PDF document text
    • http://opsnatur.fun/235317459020xy0w.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_set_the_clock_on_a_pioneer_car_stereo_deh-p4000ub.pdfIn PDF document text
    • http://extrameets.fun/28895369359k3usv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_5fdb40064ecd3.pdfIn PDF document text
    • http://hookup682.site/turbo_racing_league_onlineseybv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/how_to_use_power_probe_iv.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/24542280850.pdfIn PDF document text
    • http://vudagolefedofa.epizy.com/gelet.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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 5020 bytes
SHA-256: b1feef841e7cf7a055f9a9fe7ab3939ed4c6be0a35cba438b7c4ccf23395a039
font_01_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 10564 bytes
SHA-256: 2d6fbd5b9b5d6dac02372e6a0e42a4123e389a883311c7ad977123f324527ecc

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