Malicious PDF — malware analysis report

Static analysis result for SHA-256 7523155db9c8cfd2…

MALICIOUS

PDF

107.8 KB Created: 2021-03-16 21:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2efbb186f69dc0f6af83cc489442680a SHA-1: 83d7d01c263e41d28810462efac8f84398b7e1e5 SHA-256: 7523155db9c8cfd2aa4c0ceed942983d335b77cf0760309c21dbdd0af0407666
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be part of this scheme to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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/wix?keyword=mexico+ciudad+de+papel+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404514/normal_5fe12cb65b046.pdfIn PDF document text
    • https://vepufekuso.weebly.com/uploads/1/3/0/7/130775624/vinukanaxogabolad.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/zarod.pdfIn PDF document text
    • https://lonapumerupa.weebly.com/uploads/1/3/4/8/134853684/bca8b44a06.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/belugerufugikawenapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_602f0ee310a22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5ff8c4cdf0d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_604d32e8e0317.pdfIn PDF document text
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/3602751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff48a871fd59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_5fe7d42d4f226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_602c232d3d9e7.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/53ad8c98-86ad-42da-8d53-5f3337f320a8/64448513391.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_c0e7b4562291428eb67cb0fb27d3378b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf8d0d4-ea4f-471c-93de-98f6937eae5b/2005_dodge_ram_1500_4.7_power_steering_pump.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_b3fe6668d61f4e1795c6160e825f4b37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a3d7f9-812a-4b2a-af8b-c219f4cf3025/53095642453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577c0e07-2624-4ac2-9092-005e1f2965f0/red_storm_rising_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc670eb-198a-4e21-a547-78f22a8ce341/movajutelod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707918cc-4e4c-469f-933d-21f223882a3a/the_hacker_playbook_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4606e075-dca6-4fb9-9fc3-3d2cc3a7a26e/how_much_does_a_2000_coleman_pop_up_camper_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd124e8-8c91-4c6b-b2b0-4a5de005d60e/fundamentos_de_marketing_digital_google_activate_respuestas_modulo_3.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_4e7f8724159444898fdab9c6c85fd31d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6203f71e-b1e2-4dc3-89a0-70c704130ea4/vifezeponode.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_off00016888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16888 4948 bytes
SHA-256: 9371d7475c669d5c76fa267fd3b730b40c33a80e94557d8f1454adcaaacf96d8
font_01_sfnt_off0001798d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1798D 11952 bytes
SHA-256: a1338adc07225840883896a63f72307f648a6a99b403ac2d4ccafe294f738158

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