Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bc1a4ce77dbe41…

MALICIOUS

PDF

78.5 KB Created: 2021-03-01 08:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 61167aa0b8473409bc8aac0c5fdd35cf SHA-1: b1c1a9f456afc831aa245844d743bb77020186eb SHA-256: b4bc1a4ce77dbe418a81828d1e3c17aa4bccfd2e1260e618a4253d673ca0bce1
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+to+enter+letters+on+iphone+5+keypad PDF link annotation
    • https://cdn.sqhk.co/medijamowole/EifU4gj/tunewogosuguniwitap.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/idxjiTR/9829917550.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/auU4DeV/94526434356.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/95099423156.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/how_to_count_calories_eating_out.pdfIn PDF document text
    • https://cdn.sqhk.co/fosigigamef/fjbgiha/jozasovoli.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/eiwridH/26261505724.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/XticKjd/virus_attack_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/9ZH4gjG/fujedizuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/g6jhV7C/best_funny_videos_for_whatsapp_free_download.pdfIn PDF document text
    • http://digitalmicroteter.xyz/the_madwoman_in_the_attic_infection_in_the_sentence_summaryps3x8.pdfIn PDF document text
    • http://onlineeshop24.xyz/division_fraction_word_problems_with_answersdfyie.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/yamaha_yas_203_soundbar.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/JphdWlv/6968093508.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/bojakigifo.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/97275479344.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/88749332612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/user_manual_for_samsung_gt-p3113.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 5388 bytes
SHA-256: b81fde46c6a4d9ba3b2b25e1fcbf18df1062908beed9a9c3c848cd622720cb68
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 10924 bytes
SHA-256: 0471bfc0f07f07c617823d2e289babea5f4c257faddfa678293bf81d31d4efa2
font_02_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 16304 bytes
SHA-256: 8fe31ac2096c5e11ca20e474ac9d4b0e624cd7c6a3d6648e58269b78a2b36287

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