Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13f770d51b5602c…

MALICIOUS

PDF

85.7 KB Created: 2021-05-10 21:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57ff27130601bfeba7d1a1ecc38d8698 SHA-1: e0b669ba6ac175e7482c3cef5196ea76535cd3a1 SHA-256: a13f770d51b5602c5e6c4c74482d5f81aeb6663b8c9af675e1dcb1168b8a5217
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 are likely malicious, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The document body, though partially corrupted, suggests a lure related to 'lockpick legality' which redirects to a suspicious URL. The ML classifier and ClamAV strongly indicate malicious intent, likely for phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=is+it+illegal+to+own+a+lockpick+set+in+oregon
    • http://leporabev.mywebcommunity.org/punujakowaxabimeti.pdf
    • https://cdn.sqhk.co/pigajifaw/nTegdhh/word_board_games_for_adults_uk.pdf
    • https://cdn.sqhk.co/benibavagoge/Aggjdie/onedrive_for_business_download_folder.pdf
    • https://cdn.sqhk.co/webaxepibi/8Wggcmn/barber_adagio_sheet_music.pdf
    • https://cdn.sqhk.co/murafabu/wjahdjb/2943344205.pdf
    • https://cdn.sqhk.co/tuzojivemepe/bjig9nk/island_in_the_sun_chords_harry_belafonte.pdf
    • https://cdn.sqhk.co/bepemuno/fmialie/escape_the_bomb_unblocked.pdf
    • http://rufoferapavinew.medianewsonline.com/zamiwowubukawa.pdf
    • https://cdn.sqhk.co/lewikokezina/ggtiajd/bevudonaperixebumidusoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gimisorixosu/sodastream_water_bottle_size.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_1ca03751d3a44cc49203fb211850d66f.pdf?index=true
    • https://s3.amazonaws.com/petubapizo/dasavaresirasirerim.pdf
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_8faa12291b76435d8b55371cf2026035.pdf?index=true
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_be19af2466a142c39f05fbf52e443dab.pdf?index=true
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_e73e98e465874c75844ad654443ba40d.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_b81264afc278416282ee518cd931a5ef.pdf?index=true
    • https://s3.amazonaws.com/sisaxu/2012_hyundai_sonata_wheel_specs.pdf
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_2ea3cd17c5504948975a9e369046f57b.pdf?index=true
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_2a50d45c354944c8bc37fa4ff1bbb1ed.pdf?index=true
    • https://s3.amazonaws.com/bejikefowu/how_to_write_a_compare_and_contrast_literary_analysis_essay.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa90.bin
8c6a3833bf436a21e079a8d4343c3ef2b860e415626804e3c95effa33c78b7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 5192 bytes
font_01_sfnt_off00010c66.bin
7323d14703269c6e34d98d49f1f24962265b2d591c35650627bca183d9fd55ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 11532 bytes
font_02_sfnt_off000133c0.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 16204 bytes

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