Malicious PDF — malware analysis report

Static analysis result for SHA-256 2745de983707dbfa…

MALICIOUS

PDF

78.2 KB Created: 2021-05-10 00:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27bba58c6e29f50d5ae82c2b534da643 SHA-1: 7672bede6697f6dc3d73f89ec8bc25adbf4d1354 SHA-256: 2745de983707dbfa7efb4ec43db19fb04627e935563e0b362967d74aab60897f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=organizacion+juridica+de+una+empresa+pdf PDF link annotation
    • http://crispyset.online/fender_mustang_2_amp_presets4a9tg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_60506bf84e9e4.pdfIn PDF document text
    • http://xafevak.iblogger.org/rabomedexoderaresidu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479441/normal_5ff70c6998c35.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/excel_vba_range_object_requiredjwfc6.pdfIn PDF document text
    • http://summer-italy.fun/vafolopcddgf.pdfIn PDF document text
    • https://tajadituzutop.weebly.com/uploads/1/3/1/4/131409135/xemotaj.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/b674365c027a6.pdfIn PDF document text
    • https://dakurawal.weebly.com/uploads/1/3/5/3/135321076/mamidojubilosuvuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_60188b01a24f4.pdfIn PDF document text
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/c04a62f1e.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/169591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa647aa9-f7d9-4972-b4e6-8f0f2235b84a/jump_force_ps4_price.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_47ea53ad866d4dac8b70380c081ffb2f.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_580d98d09cc44405a09a892a51a48a95.pdf?index=trueIn PDF document text
    • http://karuserewojax.epizy.com/chord_progression_midi_free.pdfIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_d6d9619b607e4199beade6365e7d1995.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/028076e9-980f-4bb8-aeb4-dc66b3fd0d60/3532695786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e24697d-1c18-422c-b233-b4af4b7bb562/how_to_program_a_mr_coffee_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734f0f67-a680-4d64-beb5-962138a3f44c/php_interview_questions_and_answers_for_freshers_w3schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4ff19b-7bc5-4cc0-b596-82ce83acce19/kigesevekituruzilud.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_59a4c74652b842b8a216687688bddabb.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_014789a2111d45a294f2249fe3b0549f.pdf?index=trueIn PDF document text
    • http://magixek.rf.gd/asma_ocupacional_2020.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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 5596 bytes
SHA-256: 2babaf87a7bc0c5df5550f2be04eea123b61d33c9d3ba0e86e546879f35194d6
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 12140 bytes
SHA-256: cc920f09176d245cdff8043b4dfaa0718857d31577a51cce5f49d1198ae2ddf0

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