Malicious PDF — malware analysis report

Static analysis result for SHA-256 0adeb718be3bd9d2…

MALICIOUS

PDF

75.6 KB Created: 2021-03-06 06:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da68e90be9b0e43929105124e6d37406 SHA-1: f9f38282c17c6d1405c7ecdf2212ce20c71d1ab7 SHA-256: 0adeb718be3bd9d2f69ae3cbe3a6e7b355246b12f935ba51c64f13e226b03c6d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous external links to other PDF files hosted on various platforms. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=invicta+watch+battery+replacement+chart PDF link annotation
    • https://cdn.sqhk.co/jotapepikota/b9jgpTj/cut_the_rope_2_game_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386086/normal_6003c4834598d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403951/normal_5fcb4d7969e30.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/eRqzPgf/zokerobusejidugebowafe.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/vRfhehc/just_a_regular_arcade_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_06197af99bd04904842e94f3ca716ec5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/055b45e4-823e-460f-bc7f-68e81d15024e/6993620690.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_541bdac8a5614e10a85a322fc10c7e09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffa3996-9af9-43d1-95cd-2a59a2cff0ea/77757398623.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/kamifokewanan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76338d45-122e-4b56-9b27-929a27608454/35863602234.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/tumblr_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102be05a-0144-45f0-b046-77775c65ef63/what_is_the_rise_of_luke_skywalker_about.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_cd139381dc284582b4dd7eeb5eddc62c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6efcf429-a154-4936-9d3d-1da1e8851c4f/24666703727.pdfIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_86255db6997f4ca3b6b470f2015521c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13d83f2-f73f-4206-9fe2-30641c766e98/how_do_you_write_a_restaurant_review_example.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/android_carplay_mazda_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf6d4ff-4dd6-4f33-bfd7-087df8b997ff/22784416820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c78fa19-a345-42d5-be05-89925ee3f632/farofatizamoguge.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/edexcel_gcse_enlargement_negative_scale_factor.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/baal_veer_episode_880_full_hd.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_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 5324 bytes
SHA-256: eb9501dd37dac5d3a9f10d855753bc92bcbd989ee59e900f8f8d84c72ade46b5
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10480 bytes
SHA-256: 3c81213895be4df591a2dead5120a410b052ae3c1c455a6b22d3cf20fca3e65d