Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb96637c00a0052…

MALICIOUS

PDF

83.4 KB Created: 2021-02-15 00:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 89519d1ff130cd667d7adfcb4d4d8ca8 SHA-1: 3512f564637ae9ac16e149557be2b8c612a2b4f6 SHA-256: 6cb96637c00a00529a371d84b5b4bf20643a4d5b4b07c079f63f852eb24d7ea1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as phishing malware. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to distribute malicious content. The presence of these URLs and the heuristic firing 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/aws?utm_term=%25E3%2582%25B3%25E3%2583%25AC%25E3%2582%25AB%25E3%2583%25AF+bgm+answer PDF link annotation
    • http://womenit.space/8610071430r8lw7.pdfIn PDF document text
    • http://kmplitka.shop/word_crush_answers_level_483q9hy9.pdfIn PDF document text
    • http://rasezinetoge.iblogger.org/vande_mataram_ringtone_lata_mangeshkar_free.pdfIn PDF document text
    • https://rakumimow.weebly.com/uploads/1/3/5/9/135957304/vegazok.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/hRqceS8/30359358312.pdfIn PDF document text
    • http://sks-expertiza.ru/c_type_deduction_guidesvbli3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449781/normal_5fe044c239a30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383805/normal_5ff656a3253e8.pdfIn PDF document text
    • http://basvuruizleme.online/kixotopjhx9p.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/JhageZC/39446426307.pdfIn PDF document text
    • http://kogegoleteneka.iblogger.org/disororovevikibupulizasi.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/ddmkggj/36666935944.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/tonemakopinibem/72172898216.pdfIn PDF document text
    • http://redoxewesusu.epizy.com/fakigadukamavomij.pdfIn PDF document text
    • http://zedebepibepus.rf.gd/50900977989.pdfIn PDF document text
    • http://rexawisoza.epizy.com/wodofekamuriko.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 11692 bytes
SHA-256: f68edcf03a2e20f2bc7e66ce52311d587e64569ccf133ba5ba8d18fbc46ec2e8
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 3516 bytes
SHA-256: 0cc575ccb2e25f6958d48a9f9c2cfcbae78512594b274b1a2e1a790eb810c4aa
font_02_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 5112 bytes
SHA-256: dce2da59c2ff828e49acdc93543c7f7b9b37ecc5e865ddc0a928e997e640f02a
font_03_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 10904 bytes
SHA-256: bc8523bac96f48bad8fdc7fbdbc03032bd1abf950e540879eea6023e228f2444

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