Malicious PDF — malware analysis report

Static analysis result for SHA-256 670db50e0541a192…

MALICIOUS

PDF

95.3 KB Created: 2021-04-22 20:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e693b88e222429e646484429e9c560d SHA-1: da775e37a3453e6fb7727a5f3551f2fc6da29046 SHA-256: 670db50e0541a192c9c5a28cc676809cd86f3d8c680ced56619e15c132f292ac
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms or redirecting users to malicious sites. ClamAV and ML classifiers indicate a phishing or trojan threat. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to drive traffic to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/strik?utm_term=networking+all-in-one+for+dummies+7th+edition
    • https://cdn.sqhk.co/poxofufiko/IzgdDhe/72339237963.pdf
    • http://detonic-ordina.website/que_son_los_alimentos_ricos_en_purinassf4kl.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://mexicotop.xyz/mathematical_statistics_with_applications_in_r476lv.pdf
    • https://cdn.sqhk.co/zifixanuk/jfhdmMA/93937112442.pdf
    • https://cdn.sqhk.co/tebefaravuz/hAneheS/wesite-_create_app_style_online_shop_websites.pdf
    • https://cdn-cms.f-static.net/uploads/4476010/normal_606aed10dd38c.pdf
    • http://hyipinvest.site/pathfinder_psionics1juaz.pdf
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6014a2ab731b3.pdf
    • https://cdn-cms.f-static.net/uploads/4385876/normal_6056296e10134.pdf
    • https://static.s123-cdn-static.com/uploads/4471941/normal_5fec42d2cdd56.pdf
    • http://mandarins.space/sosyal_bilimlerde_aratrma_yntemleri_ders_notlar6snxq.pdf
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5fdefead93476.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebaxa/38295996975.pdf
    • https://s3.amazonaws.com/lopadivupudexa/how_to_arrange_colors_in_cube.pdf
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_a92f72da12164f91b425208c284ef6c7.pdf?index=true
    • https://s3.amazonaws.com/mejigavukolu/epic_seven_gear_guide_reddit.pdf
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_3fba78c17d6b4161ac8ceaf29130543d.pdf?index=true
    • https://s3.amazonaws.com/pexodugosa/la_rams_cooper_kupp_injury_report.pdf
    • https://s3.amazonaws.com/rujimidujek/jajurozakavivag.pdf
    • https://s3.amazonaws.com/figugipopar/buviberojizeb.pdf
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_c7bf22e61cac43e2ab46a0ad7951b9dc.pdf?index=true
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_d063a275b1ce48e58aa80fc8b562ff83.pdf?index=true
    • https://s3.amazonaws.com/lezopobigeza/what_are_different_textures_in_art.pdf
    • https://s3.amazonaws.com/fipijife/non_vegetarian_keto_diet_food_list.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014081.bin
762ee3a7e26d6577fe523096c775cb02c90c31b62786a1fc212be1aabc440567		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14081 26868 bytes
font_00_sfnt_off000106af.bin
c46db60a7e97ec29bbdbcb9a9f7b632e5595ddef14c021f1b4b344a0c6c01aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 5556 bytes
font_01_sfnt_off00011998.bin
336c6132d0125fd4a83e5ed2df611e498ff914c84393babf8de1efa888ca456a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 11588 bytes

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