Malicious PDF — malware analysis report

Static analysis result for SHA-256 a453870a16ee39b0…

MALICIOUS

PDF

92.2 KB Created: 2021-04-20 06:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 95bf3cb26d0bb9430e982ffdac9691b1 SHA-1: 2b8af216d8103946fa51dfb594b18634cffe73a8 SHA-256: a453870a16ee39b00b6615f52dcd34ade1723cebbaba3feff7fab0194e023e5b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=5th+edition+d%2526d+books PDF link annotation
    • https://cdn.sqhk.co/gazamara/Mj9shfI/best_side_quests_ffxiv.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/Vgheij5/potela.pdfIn PDF document text
    • https://cdn.sqhk.co/jasuxerazifo/bN5I6HS/unicorn_photo_booth_props_printable.pdfIn PDF document text
    • http://niwujobexev.22web.org/delinquency_date_credit_report.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/Njiuwbf/which_song_i_dedicate_to_my_best_friend.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/qCjcigd/56354351094.pdfIn PDF document text
    • https://cdn.sqhk.co/wogigixa/hagcehh/30815310053.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/yjfIjbQ/sumenuxopurefagamowur.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/f1ohbJE/dibemoriwevajasenolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_673c3f51f9d346c39bbfd2b55523dabf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33740608-0460-4eb6-a494-f0fda90c2810/xawurosori.pdfIn PDF document text
    • http://tanadumowijilum.rf.gd/xubekesopan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165f6b80-c292-4b46-88bc-525bdf62cf1c/axial_yeti_body_and_cage.pdfIn PDF document text
    • http://zapudeni.epizy.com/angular_5_change_detection_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92413345-aa58-4ad8-866b-11fd57658244/rikebedanafokasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7e9a54-3f3c-49e6-8088-8aa8a4d10e7c/how_to_install_first_alert_carbon_monoxide_alarm.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_fbc80b83b78e45c6a1edfc8cedc74414.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_e1f71f5eb1294a229a84cfb95ffad304.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8af326-74f8-4128-8a77-90b5965016f5/redupexufiraz.pdfIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_63116de021fc4782aaf13b1177a63e58.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_1fde0e46880b417b816aaf4bbd0c149b.pdf?index=trueIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_085072a547854826bd0fec027296909f.pdf?index=trueIn 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
stream_002_off0000f085.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF085 12128 bytes
SHA-256: b8be9c6e8a60d8ffb4d2d16a039a9578aaa2a77c900966d81a08a15c4a80acca
font_01_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 4428 bytes
SHA-256: 18a6aed85f98f98a89b8192493a4f67c8ccc060d20c15a5fb9d5e98e725f5406
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 11448 bytes
SHA-256: 45d8d795e00e728c65075c3e28b82c61850cae71a01c22a994d4fcf91c3350c6
font_03_sfnt_off00014e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E27 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330