Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccde5c3dde2d5e7…

MALICIOUS

PDF

75.6 KB Created: 2021-05-10 17:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 64688c380c11b3ad3cd3aafc38d26708 SHA-1: 3e29ff2dc8d58a8a6f9ef827fa1fc622e11334a9 SHA-256: 7ccde5c3dde2d5e74b8fd350f4df9e131fcdc89d61361d6be598e7fd9e4fdb8f
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious sites or download further malware. No scripts were extracted, but the structure and URL distribution are indicative of a link-farming or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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/strik?utm_term=concise+history+of+western+music+fifth+edition+pdf In PDF document text
    • https://cdn.sqhk.co/tavevalurov/egjighd/nugebuwunapibedarajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5fe0194d77b6d.pdfIn PDF document text
    • https://cdn.sqhk.co/liritefebat/hirGce0/holiday_stickers_for_whatsapp_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_5fd8091927380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491936/normal_6004cf4075280.pdfIn PDF document text
    • https://cdn.sqhk.co/xobanozizesa/XuT3T9P/dual_space_lite_64_bit_support_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/puwetudul/VIgcjiw/jaguar_telugu_movie_ringtones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_604b49d42fa5e.pdfIn PDF document text
    • https://cdn.sqhk.co/dudilirugido/d0wge9j/risuvidu.pdfIn PDF document text
    • https://cdn.sqhk.co/mepawoworu/UjibGjC/24035062830.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/haEFigV/kimumaxifurolawir.pdfIn PDF document text
    • https://cdn.sqhk.co/gofejenizew/je2gdrh/kumoxi.pdfIn PDF document text
    • https://phivulh.firebaseapp.comhttpIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polutojufet.epizy.com/map_of_asia_quiz.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_a10a2238d39d4210bd4716f1b8a247bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/coordinate_plane_word_problems_worksheets.pdfIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_ac0b81150ce849f5b3f49d7f033b72a2.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_f8b0562c8bc24d59b73576ae68a53fc3.pdf?index=trueIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_93871cd47ec9429bb0ac3fdcb5b7aa91.pdf?index=trueIn PDF document text
    • http://bedafenewax.rf.gd/rinnai_rhfe_556fa_iii_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/age_calculator_android_apps_source_code.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/jopez.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/ambient_rain_sound.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_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 5252 bytes
SHA-256: 325002b22ec85d7029f36a133a92467f66f4a60fe4989c7a95d06da081b04f60
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 11152 bytes
SHA-256: 4b918eca9c4d6c2e75af5c518a3891064191a37d0808fd2dde68f862ea32259f