Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a70ba9c2b3863e…

MALICIOUS

PDF

79.3 KB Created: 2021-03-13 16:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7c8ff96367b686c79c2da4420efd2194 SHA-1: df10f854e39fbe1c458a374ee99fb771d0d2b78c SHA-256: 64a70ba9c2b3863e657a992ad0fe66178caa0a27022f791646d78dfaeaed0204
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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=domain+of+a+square+root+function+worksheet PDF link annotation
    • http://yozi.store/news18_india_breaking_news_in_hindi56te8.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/BgiBAbL/marshalls_hours_today.pdfIn PDF document text
    • http://rcasino.info/jowimasuzuf808m9.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/rjiTBhh/zavofukagegimepomawano.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/duxedifun.pdfIn PDF document text
    • http://nanolenka.xyz/25824386215mddtr.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/cNcibyk/ruzunesejalaboka.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/Mk8ouib/62515157571.pdfIn PDF document text
    • http://roskycnmx.com/tp-link_tl-wdr4300_installation2tgk1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66685be0-3c50-4eaf-bf34-4c2cba3a4a2b/is_it_worth_fixing_a_bosch_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26126fc-b8ce-4f86-b4cd-7ccd044a194b/lifoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71a8531-2725-47ae-be25-915966c33484/3073910269.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_7e1aa925d89e4033bb7f63701a61b64c.pdf?index=trueIn PDF document text
    • http://vepisokizapam.epizy.com/lufapurazuboboziborime.pdfIn PDF document text
    • http://kagapari.rf.gd/free_fire_department_reporting_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af53111-f29d-4e21-81c6-98cb5d3737aa/basic_dutch_grammar_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74eeea22-9f81-41d6-a3b3-35f7be5dc971/43579615973.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_8bb140a8f05e40a49cfbaf10a188840b.pdf?index=trueIn PDF document text
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_76febc1164e54de4abac17a1627b68ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdac5bd4-c449-493d-8caf-59ed06184bde/zakebitefovazuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a2fcdc-b9bd-4ac1-b935-a2af2a586e90/how_to_use_my_cloud_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43db162-ef13-4ad9-9614-c10827ce4790/adobe_premiere_pro_free_download_for_windows_8_32_bit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 5372 bytes
SHA-256: 846ab05340339628c67314899ade2d7dcc3dffe43cfec6817ff776d28cacbf28
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 11372 bytes
SHA-256: 89a85724cb0bb273d06e4d90426db435b1b152ffbb9a163464522c89fde3943e
font_02_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 16144 bytes
SHA-256: f7f944af48a1f29a4fc81369acbb7667dc0c0bb312d09d0e658341ed730dbf86