Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79c4888e3525c13…

MALICIOUS

PDF

73.2 KB Created: 2021-03-12 14:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 605591ce5d4897116b07421fcd5623cb SHA-1: 81e18d1b68952f08c033e05c5f5f02171e2f01e0 SHA-256: e79c4888e3525c13ae1cc7d5bd234633abc4810a6d5f5bc6665db78db8e23c64
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected 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 designed to redirect users to potentially harmful content or phishing sites. The primary malicious activity observed is the embedding of numerous URLs, including one with a UTM parameter that points to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=can+you+marry+in+jail PDF link annotation
    • https://cdn.sqhk.co/jimavidozeze/kwgyggI/zabifopemalarufepiw.pdfIn PDF document text
    • http://bewufidemuzuj.iblogger.org/how_many_calories_should_i_eat_according_to_my_weight_and_height.pdfIn PDF document text
    • https://dubevatuw.weebly.com/uploads/1/3/0/9/130969539/4596879.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/fQqE1hb/77234294750.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/Kid0HoH/wivugawifa.pdfIn PDF document text
    • http://kirivil.iblogger.org/was_brandon_burlsworth_a_real_person.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/gdN3Bgi/ultimate_beer_pong_kit.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/11ace5da107a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_9f0082a438a14f59b070a9310e99472a.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_5e00390582e24e21bd321037c2506efd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/634205f1-dd69-488c-b2c8-23aeeb17a9a8/22151904312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15df9f0-d255-4e48-bbd0-88da76a2a590/40281365328.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_4bae751d34c040369b45dc70bca265fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3abd4c-489c-4016-bfd0-89f34d6c3e51/free_willy_2_streaming_italiano.pdfIn PDF document text
    • http://sovezogodum.rf.gd/deferred_revenue_in_balance_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bebf1eb7-db15-43fd-a9f9-a65e57604729/when_you_wish_upon_a_star_jazz_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17f2dab-2ee9-4451-ba44-9740f0c13a73/matematicas_2_clculo_integral_larson_gratis.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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 4736 bytes
SHA-256: bb49a140efe5e97244e1a51f7c285471eec6afbc696fbaabe2b8fff4f4ae9c33
font_01_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 10108 bytes
SHA-256: 1dfe0b70681b2c10a180cf3f95994e5d6d3b05638cd99a6ce493c109f0f1d2c4

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