Malicious PDF — malware analysis report

Static analysis result for SHA-256 9487ed1cbe90c626…

MALICIOUS

PDF

151.0 KB Created: 2021-03-08 04:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b5ee53b401c0e5da697fe8ccdbb8c5cc SHA-1: 64f0ee537aa9ae28f21c9cecc9a8c4514d7b6d1c SHA-256: 9487ed1cbe90c6261cf213c90f6f4872b435f8f205646ef6f61d597d92851b9f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or scam campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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/wix?keyword=el+inversor+inteligente+pdf+completo PDF link annotation
    • https://vaxuzumop.weebly.com/uploads/1/3/4/8/134870956/duwatedipeb-rejiral-pujibawovawe-dumabutosu.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/4c913c00455651b.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/hbifhhA/black_friday_playstation_store.pdfIn PDF document text
    • https://revegeworosopo.weebly.com/uploads/1/3/1/6/131637057/tefidasabepuvaxopun.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/cbjjig7/28359898485.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/haNhIgi/twitter_icon_emoji_copy_and_paste.pdfIn PDF document text
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/xogux_duxekabi.pdfIn PDF document text
    • https://pulavirovedozas.weebly.com/uploads/1/3/2/6/132695401/senuv_waweju.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/dgfK2ih/call_of_mini_zombies_2_hack_apk_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_497db8e69b9a4455bc3dc69dba91f467.pdf?index=trueIn PDF document text
    • https://7f0962a0-6951-429a-bb2b-5e038d64d202.filesusr.com/ugd/1b0481_cda87cfb242d4cdabfd8681528a26c5d.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_ad2cc68389b34cd4917448b461594049.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_1992efaaa7c440ebaf0e125f3c647c7b.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_554513f72b234bf8a99f64da30e76334.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_7380f156a3f8403fa91d4f5d6d5d5116.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_d9863d55c976439cb2602451df7cd763.pdf?index=trueIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_bb0ae4fde36b446b892fa85e782a8bb9.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_d37b76a5660a47c7a080dce76a2afb4a.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_eb74cef5c1e44904b2ba351a3d71b298.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_5d5a1451e918461fb3e8a7461707df3a.pdf?index=trueIn PDF document text
    • https://e249ec0f-4346-4527-b7e8-467203529c4e.filesusr.com/ugd/f96b02_b0ff64a6eedd428880427ca2b3f86f43.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_f1094b5c9fac490da5b6336d8882483c.pdf?index=trueIn 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_off000207c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207C1 5284 bytes
SHA-256: 68265eb525efd1528db9e005f7b00f99951acdc73385fbfdbfd36196d2fc0c00
font_01_sfnt_off000219b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219B0 2092 bytes
SHA-256: 0f740872c9ba99ba2808e86ca1aa710947acf25eef927d3004a187dd3557d740
font_02_sfnt_off00022356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22356 12316 bytes
SHA-256: d4dc56eac00266b84c828c12c2afa58044d3af4df7c7e5d7822ab7ba6825286e