Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5bb88b775d0c79…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 17:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f4729ae086d47d63882089cdce6f36d3 SHA-1: dc281a9ab4c3b2433636f458504d0db8635388cd SHA-256: 2e5bb88b775d0c7923484f4827e8df10a376a28debd362e8c306c30d028e2a00
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'https://zajinet.ru/strik?utm_term=to+my+dear+and+loving+husband+shmoop'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detection confirms it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged it as malicious. The presence of embedded URLs and the link farm nature suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=to+my+dear+and+loving+husband+shmoop PDF link annotation
    • http://jikusofare.mywebcommunity.org/anatomy_atlas_download.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/96014743136.pdfIn PDF document text
    • http://fopekoriw.sportsontheweb.net/45306325582.pdfIn PDF document text
    • http://risozeretelefa.22web.org/arthritis_research_uk_back_exercises.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/87080427619.pdfIn PDF document text
    • http://gamonigujubi.22web.org/harry_potter_audiobook_6-7.pdfIn PDF document text
    • http://fozakewugumomig.22web.org/24557296490.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/7f5f2eee-3c0b-4b27-b371-197d5002f939/34890088809.pdfIn PDF document text
    • http://pavunununege.epizy.com/handshake_tweet_meme_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/losorudiriserexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9cdf581-5132-4e70-8aec-c22d177a75a2/tivigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0104ea55-e6ec-42a9-bc49-024086ad3052/constitution_scavenger_hunt_answer_key_us_government.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/99981508776.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/34218289866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a926b5-5760-48c4-a5b8-bb499f90ef80/61734965179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207accf1-7903-4732-b929-043a0717e2c1/dekelotujiroxoporideja.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/fifty_shades_darker_watch_online_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/47667009660.pdfIn PDF document text
    • http://vemesivudaro.epizy.com/pawituji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b447861e-72a7-4750-b688-5c33a13a900f/phrasal_verb_step_off_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31828afa-55e2-4bc4-af97-e6cf776cac1b/how_to_change_garage_code_keypad_clicker.pdfIn PDF document text
    • http://rodobokojezaga.epizy.com/queen_s_guard_uniform_history.pdfIn PDF document text
    • http://rawonuruked.rf.gd/easy_christmas_sheet_music_jingle_bells.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfa66d1-ab0d-4c0f-a50d-3b427cba4490/ap_worksheet_00d_elements_and_symbols.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_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 5624 bytes
SHA-256: 9d9a53fa71f0160a7421e9cea660d66774a03395fe4912d864d528f13128d6c3
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10600 bytes
SHA-256: 639055973b822ffefb8a2f22d434b6ac93775063ea76f9fa383092fd4e003a3a