Malicious PDF — malware analysis report

Static analysis result for SHA-256 2679551c28ade455…

MALICIOUS

PDF

85.0 KB Created: 2021-04-01 14:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2df035ed777724c51fd9fd0266b8541f SHA-1: 73ae16ff50c2351b4a99044a013415d6d96226c8 SHA-256: 2679551c28ade45562524656bca710f9b6c625f24d4a7f14f5561b0c396c1be9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm. One prominent external URI points to 'baarspo.ru', which is likely a malicious domain. The presence of multiple benign-looking PDF links suggests an attempt to disguise malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=chapter+3+test+geometry+answers+form+g
    • https://wikivosunox.weebly.com/uploads/1/3/2/7/132741322/jejisepijakudu-dotowamu-paturenadowipig-sekokirejazudub.pdf
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/xakoxadir.pdf
    • https://jafadunew.weebly.com/uploads/1/3/4/6/134632108/d35be043f533c7.pdf
    • https://xiwotedusogatif.weebly.com/uploads/1/3/0/7/130775269/b89619fbdd9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_9889766bc101417f93f917abc0e740d4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/09708442-f927-44ea-8a32-4709ff0e71b0/after_the_trade_is_made_david_weiss_free_download.pdf
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_d3686eacec0441eeb01c60cd064b5812.pdf?index=true
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_9add8b359543495e8b3f6b057fc7c6e7.pdf?index=true
    • https://s3.amazonaws.com/fadupazageraf/ssc_chsl_2019_form_fill_up_date.pdf
    • https://s3.amazonaws.com/fevobelijogal/why_do_i_have_blister_on_my_hand.pdf
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_1b3d4d15cae148c2a80bd36dcdd3ee60.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_e34ad3b3806e454c9400daadcaa4e58a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd29ea95-3a5b-4171-a500-6f4bf0c6fab7/pitewawesuxorusojexe.pdf
    • https://s3.amazonaws.com/vigevot/26057059467.pdf
    • https://s3.amazonaws.com/nafibanefexex/commando_2_film_video.pdf
    • https://s3.amazonaws.com/sowewazulejewi/vampire_diaries_damon_and_elena_first_kiss_episode.pdf
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_415d2477575d4292a97f1d2378efa458.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92a49161-3c64-4ea5-9449-a8fa994475db/isentropic_efficiency_of_reciprocating_compressor.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_0ebb7a57c2b6450b85c08da229d1052d.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb0e.bin
40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 2900 bytes
font_01_sfnt_off00010552.bin
2222c0c7e495c252ccdaa01083222d902723aba865315a2735ce18a7beb342e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 5548 bytes
font_02_sfnt_off00011821.bin
2fd98fd8130d77234fd940faa0894bfd8ffc0d553c913cda757420425e51e5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 14492 bytes

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