Malicious PDF — malware analysis report

Static analysis result for SHA-256 8851da2923335754…

MALICIOUS

PDF

83.8 KB Created: 2021-04-20 04:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2153176bb52efe31ae48729ce05e4cbe SHA-1: 77fb2968c121a4977a9a3099c52ab8923f5cb3f4 SHA-256: 8851da29233357547550c6e43560e9aff44fe7f771625451fd8ec5bd492c46f6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including a suspicious one pointing to druttle.ru, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded links and the overall structure point towards a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/strik?utm_term=llamadas+telef%25C3%25B3nicas+roberto+bola%25C3%25B1o+pdf+completo PDF link annotation
    • http://boldly-grow.com/37039190009p68kr.pdfIn PDF document text
    • http://slimerecipe.org/balararewevawulidekafavek5wcf.pdfIn PDF document text
    • http://byt-upak.ru/the_innovators_dilemma_by_clayton_m._christensenf68hg.pdfIn PDF document text
    • http://kino-vezde.ru/free_download_3d_max_2009_software_full_version_with_crackrdrx3.pdfIn PDF document text
    • http://milktree.store/4601138879ycbts.pdfIn PDF document text
    • http://doucheop.xyz/ice_cream_maker_for_sale_in_south_africa9hf0x.pdfIn PDF document text
    • http://funseeds.site/xomagokojdqrta.pdfIn PDF document text
    • http://cethq.xyz/dixie_chopper_stand_on_mower_prices5ceyw.pdfIn PDF document text
    • http://santecmb-sarl.com/resident_evil_revelations_cheat_engine1wxpp.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://bratskpravojur.ru/club_car_onward_6_passenger_dimensionsqlvhl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_7eda0e6202b74322b561157d2d5e082e.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_9496d20aec3d44dca7de3708e277b52d.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_524e85902e864e818275849d36ae014a.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_06527ee9645843daa6b757e9c9db8c0d.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_3d2ee7299cd44b62a9b78fdae9abfd8c.pdf?index=trueIn PDF document text
    • https://90b6428a-f85d-4fb4-90f7-6cca40d0dc23.filesusr.com/ugd/55544c_b907d93a936d4434b2abc63ad1759e84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/488bb6f8-6c71-4188-9b8b-7170331ec3bf/how_many_terrorist_attacks_occurred_in_the_united_states_in_2001_brainly.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_4fee36278bc34987a384a62d33282f6c.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_9d54133346574e48a920652e44b75809.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c3e1b4-5f4e-4bb4-912b-ee76d1d29d19/88857511960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bb6d66-8bcb-4e08-8acb-c1547a3f59c2/rikuroz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 5520 bytes
SHA-256: ee328e3fa3a57831862ece817f34a9307e229c8c643797cc55b1d43b935d28c1
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 12508 bytes
SHA-256: 123605258b596e5f87259e42f48cb04acd7db4889f8bb77b084440d178198031
font_02_sfnt_off000130fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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