Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af1d642c1d8c7ba…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 18:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca77e9793a2a98fb119a0fa44d06d200 SHA-1: ddf2278f0b08356004b26c2dde8720b964dd7aad SHA-256: 2af1d642c1d8c7baf7cd31ab373e81778087462747c5a41d241e39ecfb416019
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or a method to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs, such as 'https://botokaw.ru/aws?utm_term=craftsman+garage+door+hardware', are likely used to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/aws?utm_term=craftsman+garage+door+hardware
    • https://cdn-cms.f-static.net/uploads/4370737/normal_60645333e2963.pdf
    • https://cdn.sqhk.co/fodexuxefeba/hihj5gc/fotefivudulozalufigipa.pdf
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/23275336a.pdf
    • https://cdn-cms.f-static.net/uploads/4476938/normal_601be59e5596c.pdf
    • https://tonepadinaza.weebly.com/uploads/1/3/4/0/134017798/1d921ab.pdf
    • https://cdn-cms.f-static.net/uploads/4401703/normal_605216b72bd93.pdf
    • https://cdn.sqhk.co/lupokuna/DGhjLja/dreamers_movie_trailer.pdf
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5ff0b29706194.pdf
    • https://cdn.sqhk.co/dujagazatad/jajbjaP/62092563868.pdf
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5fe2a9b172b07.pdf
    • https://cdn-cms.f-static.net/uploads/4491159/normal_603a1a0f64688.pdf
    • https://cdn.sqhk.co/sovokeduseb/dhigsjX/34954412353.pdf
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/7042028.pdf
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/nibovixefipivuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c832740-898c-48b1-aeb3-756808f51ce1/this_bridge_called_my_back_table_of_contents.pdf
    • https://uploads.strikinglycdn.com/files/bed60177-41fd-41f3-a4a7-71a7ae3c8fb1/how_to_get_cooking_merit_badge_counselor.pdf
    • https://uploads.strikinglycdn.com/files/51a36a61-a5b9-47c3-904f-eb3fb57f9b6f/que_es_una_composicin_literaria_ejemplo.pdf
    • https://uploads.strikinglycdn.com/files/0e919a86-b4fe-44e2-80ce-2976f11333aa/city_of_lost_souls_cassandra_clare.pdf
    • https://uploads.strikinglycdn.com/files/c655e6d6-e687-4f71-818d-f8a27983bdb4/which_is_the_fastest_growing_major_economy_in_the_world.pdf
    • https://uploads.strikinglycdn.com/files/2a62fb70-480c-4ce6-a7ee-e1fc8eda03f6/16912662133.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99d.bin
c4c698fca26879027b10ba9adaa3f7ab2edc3e06594af2282ef84f70bc7b6332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 5288 bytes
font_01_sfnt_off0000fb77.bin
38769251b8d603a591157dcb798ff1202a7da2a6b2ad057a628fc530d4f3ae52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 11044 bytes

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