Malicious PDF — malware analysis report

Static analysis result for SHA-256 465d53a34deca247…

MALICIOUS

PDF

84.9 KB Created: 2021-03-15 17:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c4dd378f0f36b38d664688815b039b3 SHA-1: 29ed4759210589fa41579a77b48b702f76f3a0da SHA-256: 465d53a34deca24749518ca969ed85996ff7b70ad3c4d6019f31c659f2f0a496
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, with a primary focus on directing users to a URL that appears to be a search result for academic content, likely a lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to distribute a large number of linked documents, potentially for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=magnesium+oxide+pre+lab+answer+key
    • https://cdn-cms.f-static.net/uploads/4480399/normal_602283e4db1ff.pdf
    • https://static.s123-cdn-static.com/uploads/4454419/normal_5fcbd4ac824d1.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_600afb97a49b8.pdf
    • https://cdn-cms.f-static.net/uploads/4488807/normal_6044f4424cdaa.pdf
    • https://cdn-cms.f-static.net/uploads/4489615/normal_600e94dc6ed4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/42afcb71-7817-4bc3-a895-6b83dea69525/blue_eyed_mini_dachshunds_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/f06670d9-b15b-47e9-8d42-650050b20e90/kikofabuv.pdf
    • https://uploads.strikinglycdn.com/files/7737c81e-1180-4b63-88cf-89bcd9f6ee2d/will_insurance_cover_prenatal_massage.pdf
    • https://uploads.strikinglycdn.com/files/d52dfe21-dcca-4517-af87-9fdb4800641a/3978591083.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_4b486a93e7b645a3adeef85458f9c442.pdf?index=true
    • http://romajox.epizy.com/11220918448.pdf
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_8bb000928870460c9dee3dc74c89e85d.pdf?index=true
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_13587f0a045149bc82dda1347bd0ed1a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d98a7e0-822b-4e6c-8209-fb1b87a0827b/cuanto_es_una_pulgada_y_media_en_mm.pdf
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_dbb352fd37ad4b47acf4b339fd967ae8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b4fed234-d693-4b81-8395-5ba7015bd7e1/votitejakugiwilak.pdf
    • https://uploads.strikinglycdn.com/files/e7dd3d42-176a-4690-a64a-1b338377f222/84826002990.pdf
    • http://gozulejawefufap.epizy.com/spotify_premium_apk_mod_offline.pdf
    • https://uploads.strikinglycdn.com/files/43f4cbca-ddf9-4c8d-bd1c-c79788980121/how_to_calculate_pressure_from_air_flow_rate.pdf
    • https://uploads.strikinglycdn.com/files/8f31228d-c047-4164-a55d-161d5e11aaec/nike_air_force_1_love_letter_release_date.pdf
    • https://uploads.strikinglycdn.com/files/eddb2b04-fb0f-43d6-8190-61d99c4ec8a8/tezeg.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ab.bin
dc299374ccc3af1197356bad76121b475e311b8033b14d77c09da97fd56ef504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 5552 bytes
font_01_sfnt_off0000fc80.bin
0f6f0f3575fb050b0c94d35656e50d78fe03b14fa88f01024ee7d01d5938692f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 11088 bytes
font_02_sfnt_off00012283.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16096 bytes
font_03_sfnt_off0001374d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 4324 bytes

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