Malicious PDF — malware analysis report

Static analysis result for SHA-256 3827c705ebcc1841…

MALICIOUS

PDF

76.9 KB Created: 2021-04-23 22:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 66c108443ac8b4ec7ec9eb64636e7544 SHA-1: f4f886b6eb320759656a0e4a4afc27258ed50913 SHA-256: 3827c705ebcc1841424af77c9dc8763fb2ca6db611af09b0f402f83d1a02ac48
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to search terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=sears+battery+charger+instruction+manuals PDF link annotation
    • http://xuroriwonufuz.scienceontheweb.net/61191670608.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/E7dicJF/inside_out_cast_disgust.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/92501055322.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/ihjhjc3/linkin_park_in_the_end_piano_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394079/normal_5fe544a7cce81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_6006e60e2c7c3.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/cTjaSjd/old_telephone_ringtones_app.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/participle_adjective_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_601c947bcfb86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidodexogejax.myartsonline.com/tezepavum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb245eb8-76a7-4250-bfff-6044cd4e5986/1100_words_you_need_to_know_download.pdfIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_a81d0bc554044013ab19894d34e78407.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_e9841dc1ae924990b9827c727c7793e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/976897f0-7662-4e17-9263-34fe280cdc36/67948769981.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_d2c10984e3144927a835b675d17d00a7.pdf?index=trueIn PDF document text
    • http://nozozuwovore.atwebpages.com/cateye_strada_double_wireless_blinking_display.pdfIn PDF document text
    • https://93a2b5bb-aecd-41dc-861f-07dcdefec443.filesusr.com/ugd/dee83c_502e83b466464f1ab931d65ab8d6df6b.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_8203c5919f414096b71bfa8e4d9c3528.pdf?index=trueIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_edf60d710ba244ba9ec36a5e2ed591dd.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_b426862f77b349aebf365f12715e7e8b.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_d8b0bcccb0044e8b8582c3575b6c43dd.pdf?index=trueIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_76a593c34ced47248c490cc24e62b6c0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 5560 bytes
SHA-256: 5b71285656425aa2f131756f64a1f341f320ffd312bb447671724758d3dc06c8
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10580 bytes
SHA-256: 9d9f8a6c9472bce67aaab9db8389f2154532d19704b03405448720076260fd7a