Malicious PDF — malware analysis report

Static analysis result for SHA-256 77480c1e21d5db30…

MALICIOUS

PDF

77.6 KB Created: 2021-04-01 15:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6813e4aadd4df4c948e73a16c7b447fc SHA-1: eb7adfdf066e4239a9d26a5652661f0fb5feb172 SHA-256: 77480c1e21d5db301b1a60111ac46a529f2e52f67b063e656c023b625613229b
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 0.9995

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://ponafet.ru/wix?keyword=night+by+elie+wiesel+test+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366306/normal_60319970b7507.pdfIn PDF document text
    • http://igcopyrightverify.com/how_to_load_photo_paper_in_hp_officejet_pro_8610bw3mm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_60117708b4418.pdfIn PDF document text
    • https://jibigevemur.weebly.com/uploads/1/3/0/8/130873945/7359807.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/rikerisejoniwilizug.pdfIn PDF document text
    • http://gravkamen.ru/71182996325saotp.pdfIn PDF document text
    • http://damvglaz1.xyz/gupejefunefijemedidakiv7exjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_6013b31555c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_6021f7830cb35.pdfIn PDF document text
    • https://vefibaxo.weebly.com/uploads/1/3/1/3/131379874/vosewomok-kesowiluwosode-jigokegez-fositepol.pdfIn PDF document text
    • http://betmoy56.com/958395170934d16d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_604cb7da15449.pdfIn PDF document text
    • http://stassikorskyi.com/norukapijokizujogeljmaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8597e683-af9b-4a2a-8cda-d3c547e3f831/43438607731.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/fly_fishing_rods_for_saltwater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a90ed5-2885-452b-8919-9664a9218e15/wojigerenojofakefawukewox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37916ece-114f-4561-8456-8d15eabbd00d/logitech_g700s_mouse_software.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/42459862679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808b0da2-5842-4d44-a8d9-4b6da460aa97/cuanto_equivale_7_mm_en_pulgadas.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/police_supercar_racing_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/nekuduzenopitirewavilod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c23043-9706-4a3d-bdb6-f68f15d5a7ce/romutipofax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 4992 bytes
SHA-256: fcfa72648bec6e54512506a9a5da85f1ff1a16a90357c416196885dcad6bb3ae
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10736 bytes
SHA-256: bc13a729c5dfd7a05f1d6331ca978df53f6632a30ee0f28c1b4183e489285d07
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f