Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f9ad7db3f74a32…

MALICIOUS

PDF

91.1 KB Created: 2021-03-14 00:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d23d7ee12eb3298a6748dc51a6390a0b SHA-1: ddea3d626536c1bcf68fec170aee197aeb15550e SHA-256: a1f9ad7db3f74a322717a7ff219d9385bce6cd1cbb3f622c5c2b77c987044a89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9988

Heuristics 5

  • 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 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://gimoguvi.ru/123?utm_term=bengali+movie++2016 PDF link annotation
    • http://topsalon.xyz/25589993293wqd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_60292c2e371fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_60495cdfced94.pdfIn PDF document text
    • http://tuimag.ru/porsche_cdr_24_wiring_diagramplc9q.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/nudupegebu.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/bistec_wr30m_watch_price.pdfIn PDF document text
    • http://javefuxola.getenjoyment.net/20617083189.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/ihfAzln/97620790090.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/hUPidge/55230517524.pdfIn PDF document text
    • http://white-x.fun/44511083715g8bq4.pdfIn PDF document text
    • http://gayerkan.com/govanubegebudavisogiv9zqel.pdfIn PDF document text
    • http://remontnatali.ru/proof_of_service_by_email_family_lawz57z6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_60298c6f353d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf3f4da-66c2-402f-a084-3a0155b4de46/howls_moving_castle_book_wikia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c457ee02-3d40-4be3-86e6-6f679f2cb28d/6167139367.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/hp-pavilion_dv7-3000_service_manual.pdfIn PDF document text
    • http://zepibugab.rf.gd/landscaping_invoice_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5694b3ba-faab-4da3-af4e-e903f07c0e04/summary_of_the_house_of_spirits_by_isabel_allende.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8d0932-948a-4e03-9aed-15984722c21e/19653113639.pdfIn PDF document text
    • http://vamavaremimot.atwebpages.com/jebaxirivena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8c40a7-31be-44a8-a461-e3eb78b37f63/22888739791.pdfIn PDF document text
    • http://pemuginikuj.epizy.com/zibareliputarananotut.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://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5320 bytes
SHA-256: 286e5156d239c08c7209348c783b08f76175d16ebfe327f9216d296285c27459
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 20968 bytes
SHA-256: cb30ccbe3470e24abea742643761fe43cfe74664858df86eeeab0c9a4c342ab2
font_02_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 2276 bytes
SHA-256: bad47d694a1dd9c664d92593e9aa530dcfdac95caf8f68d8ad6f6049d2ff5117
font_03_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 11852 bytes
SHA-256: 5afc03a8c7bd81da2162b6a1581cdbaa459694aa1a8162e56068db30ba3ada88
font_04_sfnt_off00015532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15532 2056 bytes
SHA-256: e56f5db8faf554166087922806b3819c377976d94af14c6b8a512386de68c265