Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6963efd4b290f2a…

MALICIOUS

PDF

74.3 KB Created: 2021-03-12 07:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6687d27e55a0392e4a3a429839945469 SHA-1: 22cbfc448dc91ce9941ea5d165ef3d2e881dc603 SHA-256: a6963efd4b290f2a7afd5cbafa3a2bb2488bfec474103f6d7bd14a9d12c41750
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 0.9956

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://dugedepap.ru/award?keyword=amortization+schedule+formula+pdf PDF link annotation
    • http://pilebaketuvene.iblogger.org/eureka_airspeed_unlimited_pet_replacement_parts.pdfIn PDF document text
    • http://1ux.site/coat_of_arms_study_crossword_answer4ol4k.pdfIn PDF document text
    • http://dumanejixaw.66ghz.com/how_did_the_great_depression_in_canada_end.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/YgjhcuQ/firirisunori.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/cKhgujd/gerekoged.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/WDj2Gia/nolan_arenado_injury_update.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/hcg2jb9/nosimudejuzavaluwet.pdfIn PDF document text
    • https://cdn.sqhk.co/jadosoxiko/3ffiige/cheap_international_calls_from_ee_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/qUge0gs/prestonplayz_among_us_hide_and_seek.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/igmDD5Y/31409470973.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/RFieidV/jitezogedof.pdfIn PDF document text
    • http://checkmycredit.info/dupavovepugaryudy7.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/E0ihgdl/rare_beauty_eyeliner_selena_gomez.pdfIn PDF document text
    • http://mamajan.space/google_earth_download_free_2020_apkyhtva.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/jagj0fz/go_launcher_z_prime_remove_ads_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/rk3gjii/corporate_strategy_planning_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/aVsJSBT/badebadewefewijoxul.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/ibgdpgd/45535790524.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/Kuje6AL/gusubukezugotepumin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_aa84b3667e664b8ebae421635cfb7f6f.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_3db9116ad1b74ef9976bac746afb1e51.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_cc71cf12b6a1451a81fde82f20e1936c.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_d489229d349343b785a2e3ba316417fc.pdf?index=trueIn PDF document text
    • http://bulufuw.rf.gd/68289728960.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_39d99e3a2e054308a9d3f78859171b3a.pdf?index=trueIn PDF document text
    • http://lesasesodimavun.epizy.com/32142317664.pdfIn PDF document text
    • http://demexap.epizy.com/oxidation_of_ethylbenzene.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 5432 bytes
SHA-256: c9ab1f61141ad82a2f0a269b98df22a8882dc046fc672e6ab9802710f6f0e024
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 9920 bytes
SHA-256: 400abea70abc4f424cfd7345c71cb761073f2d49256f77a78f7fccb034b07f14