Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1f51e73a3559b3…

MALICIOUS

PDF

94.6 KB Created: 2021-03-04 05:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c492b37563fc164e4df842bc979102e6 SHA-1: 19e12861a515d990edbeb3b6201ac86606b83b51 SHA-256: 1f1f51e73a3559b374db751ce729d5642034f136fcc45a814fce1f8f0871ffad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/infin?keyword=tascam+dr+40x+review PDF link annotation
    • http://toxipoxekej.medianewsonline.com/what_actually_happened_at_the_end_of_vampire_diaries.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/a2Qzjjn/screen_recorder_for_windows_7_32_bit.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/figopeket.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/xaretezejusu.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/zshiygi/gun_shoot_war_q_mod_apk_unlimited_money.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/xegute.pdfIn PDF document text
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/6777023.pdfIn PDF document text
    • http://50off.pro/demolition_derby_2020_calendari3s72.pdfIn PDF document text
    • http://medyayazilimtr.com/95461982510xns1.pdfIn PDF document text
    • https://jaduxopedarev.weebly.com/uploads/1/3/4/7/134749363/6220d2ca16571.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/kimuzabibirabafeti.pdfIn PDF document text
    • http://ductsunlimitedins.com/aptitude_shortcuts_and_mind_tricks8usdo.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/gagagakigibapo/90081950613.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/sarasupopurabidamunamef.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/brave_browser_zip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 17712 bytes
SHA-256: a976373f5c7f1c0ab2d74defdba310c1ac1dea61b056c2dace1be6661fb35602
font_01_sfnt_off00012c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C62 5452 bytes
SHA-256: 109e648c9b6d54aa112a143c87160990255e5267d920b61411c70879e8150ccb
font_02_sfnt_off00013ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE7 14944 bytes
SHA-256: 24dff25f92fd0babd9f3fd6cf957c3c15378be4ff9e1f85d69ec171bf2ceb05a

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