Malicious PDF — malware analysis report

Static analysis result for SHA-256 e976fe56d4b11fee…

MALICIOUS

PDF

130.9 KB Created: 2021-03-04 04:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e970b78eea6c4e3d81e60419a7d0cec SHA-1: 0a8ad9c4ec076858772fc0710b9745ad50c7c82d SHA-256: e976fe56d4b11feeb512ecec574fb7ef77c67206d77d60f534e2d6b72eaa0004
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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
  • 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://jottigo.ru/123?utm_term=official+cpc+certification+study+guide+2020+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5fed37b4538fa.pdfIn PDF document text
    • http://kuzojud.66ghz.com/asus_rt-n12_d1_user_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366965/normal_5fcf2883de2a7.pdfIn PDF document text
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/5805331.pdfIn PDF document text
    • https://nazixusa.weebly.com/uploads/1/3/4/3/134363102/777ccc.pdfIn PDF document text
    • http://blog-millionaire.buzz/tevibinadevewirupukupb00ar.pdfIn PDF document text
    • https://fadesirowawilej.weebly.com/uploads/1/3/1/6/131606674/cc14673cf.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/what_is_shadow_boxingvbymu.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/6048640.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/kuk_distance_ba_final_date_sheet_2019.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/dunetutanaze_muxuf_vukovapuj_naxen.pdfIn PDF document text
    • https://nifabixiguwo.weebly.com/uploads/1/3/5/2/135295020/98109216fd5029e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasufigosekuwuw.rf.gd/how_do_you_turn_on_the_heater_on_a_mitsubishi_air_conditioner.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/live_camera_translator_apk.pdfIn PDF document text
    • http://dekovegetubabip.rf.gd/69301581493.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_off0001c091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C091 5816 bytes
SHA-256: 05c0cf65d16f0a0f33074bcee3da8daf0e6b66c1f23885102018f711f35cf76b
font_01_sfnt_off0001d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D488 12156 bytes
SHA-256: d3edb5a3a27dce97c165f0f0f0e6f0b3a98ab374950475cdf9753006d161fa80

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