Malicious PDF — malware analysis report

Static analysis result for SHA-256 a018791dafe5724f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 02:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ce3eb2a64405a9b1bbb614ad2a5c34d SHA-1: 82cc46ce88467e9d51e2033f5714c384f0b60c94 SHA-256: a018791dafe5724fb3b7c9e303c3af9c9cd806bcb78562047e4b46f83a6e8271
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a link farm or phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/wix?keyword=famous+witch+familiars
    • http://zajevafegex.iblogger.org/92936466968.pdf
    • http://fesilax.22web.org/how_to_get_a_land_grant_in_texas.pdf
    • https://cdn.sqhk.co/zumedizojas/LifxddO/62716231119.pdf
    • https://cdn.sqhk.co/vatopibar/Gcgjhd9/world_war_ii_arena_crossword_clue.pdf
    • http://zagejudivavi.sportsontheweb.net/assessment_and_evaluation_of_learning.pdf
    • http://rimiminigi.22web.org/77729987686.pdf
    • http://kirakexig.mypressonline.com/john_deere_214_for_sale.pdf
    • https://cdn.sqhk.co/zejizoguzut/diapfHS/black_friday_deals_on_tvs_at_walmart_2020.pdf
    • http://vuroxinizona.scienceontheweb.net/rudram_chamakam_namakam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zolerazowubow/how_to_replace_limit_switch_on_goodman_furnace.pdf
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_8e7cb3bdf4984ed19409e87a4405377d.pdf?index=true
    • https://s3.amazonaws.com/toguvaju/bubewuzobumisegijekuzubo.pdf
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_a5cfe379c19e49158284e2583f83261e.pdf?index=true
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_e6773ade374647f3a0049bb766ba9781.pdf?index=true
    • https://s3.amazonaws.com/dowadotiju/centrifugal_pump_design_and_application.pdf
    • https://s3.amazonaws.com/tibitexil/how_long_does_the_vivitar_drone_battery_last.pdf
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_8067b39c517c4f09b54726a78f0d704b.pdf?index=true
    • http://luremugaxufarup.epizy.com/wine_enthusiast_32-bottle_dual_zone_max_compressor_wine_cooler_reviews.pdf
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_3e7cd01f3f0445ed8af2114b2d86f35b.pdf?index=true
    • http://bigobawavelig.epizy.com/guided_breathing_meditation_videos.pdf
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_2bf4686d2dd94c6f9233a8c605581100.pdf?index=true
    • https://s3.amazonaws.com/kagedatabujo/zidetadarawozizuzodukap.pdf
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_0d3729a45ee4414283d1fc87f96a9203.pdf?index=true
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_fcbc3aa5cc8a469488f4420d43be4d4c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec96.bin
5860411d6eaf62e009ed8d5efecd1f7809eea7336f697dbe00204b28a1483ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 5168 bytes
font_01_sfnt_off0000fe13.bin
ba67fe5a79accae0d81e48f71a9398c2fcb31b9a4ba43d0efa150795a8593dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 10912 bytes

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