Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b3aae3f0bfc918…

MALICIOUS

PDF

86.4 KB Created: 2021-03-15 12:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 041fe06bd4c1fee5d912a492c00db0d6 SHA-1: 85740c6de4978f59ce8666633a6cf0e6fd0cf8cd SHA-256: 59b3aae3f0bfc9181b807df10a70d60a2d2cbb3f6468240eb1f3a1f4fe0fe069
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains and link farms, indicating a SEO-based lure. The ML classifier strongly flagged this PDF as malicious. The embedded links suggest an attempt to redirect users to potentially malicious sites or to generate traffic for ad revenue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • 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://midufefew.ru/wix?keyword=instant+pot+manual+duo+plus PDF link annotation
    • https://cdn.sqhk.co/pelebitebi/chb4mgf/33150536378.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/Ucchdjs/dazudejimurefaribosokofi.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/jghdjfl/transmute_galaxy_battle_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/s3Ziiji/tiktok_songs_clean_playlist_1_hour.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/bhdiiSn/super_penguin_run_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/hdjdFd9/vamuzapivozawegur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_600a2924dfa95.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/i6tGifW/kpop_girl_groups_with_6_members.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/gdNMiiH/is_fontspace_safe_to_use.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_5ffc71920c96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_603c36cb3d390.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/ejihdyU/sepiruvenirebesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_5fda8fe05ed77.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/98510080611.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/xaduxudezogevexizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2659e08-155b-41d6-9d62-e22736cfc51b/jugiwibamame.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_941e8f9b5c8f48ae93a55f4c1285437f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rotowan/2475211993.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_e27fe74b84e94d5aa6700fd452038190.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/zapofawidijivijufagexe.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_a2f42c4e4d814b16a2fd0c78d0ddf00b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba963993-0deb-46a8-b97f-adaa7e9ab388/how_to_remove_a_stuck_breech_plug.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/30775150815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac67b62-c8b4-416d-8aa7-18902ae4a80c/24859466904.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 2120 bytes
SHA-256: f63ad4dba777ed36c0495674ab07ec0dc50da1fae4c1e7558adc4bff35cf1b34
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 4948 bytes
SHA-256: 32518699379271dd32f220bd04bf653075cf2556163408aab992fd830ff9db66
font_02_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 12288 bytes
SHA-256: 3919a6e93f0e788a04faaf43edd13149ebc89c5417d1febdb7a2d3590c0278eb
font_03_sfnt_off000135ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AC 16292 bytes
SHA-256: 1ded105c2a785beb96fac8dffb1ceadd20fd9d751745c9c68a0e3318805f30ca

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