Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c635d2aa6f8f05…

MALICIOUS

PDF

80.4 KB Created: 2021-04-08 08:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 48e9c17b932e7016c8db20ef65e8b894 SHA-1: 90198bd3e7deb9e73c07778ac0f28b1222cba12b SHA-256: 10c635d2aa6f8f0547795544cd5218e1b2412e3f978c5ec7789d6a04bd36c39b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://pelibifir.ru/strik?utm_term=2019+toyota+camry+le+interior+pictures PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://50off.pro/sepafiud00z.pdfIn PDF document text
    • http://lordtrans.ru/xawurakegenebunizevew6zkrl.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/hcii6EZ/dujijov.pdfIn PDF document text
    • http://amaryllis.space/skyrim_sex_mods_in_actionxcxty.pdfIn PDF document text
    • http://legrand-spb.ru/salt_and_sanctuary_mage_guidefc9is.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/98184677713u5a15.pdfIn PDF document text
    • http://ericksandoval.com/mathematical_modelling_kapurenkgk.pdfIn PDF document text
    • http://azorocheat6.xyz/draw_it_cute_brawl_stars_sprout0qudp.pdfIn PDF document text
    • https://cdn.sqhk.co/jonidamifene/hgZhajc/cours_sur_l_amnagement_du_territoire.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/cd2657b7-5521-43cc-8772-eef4b1d93da1/mivefelusibipekitefabej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cdc7303-e820-49eb-93ae-1f29b033e768/56725517903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a751e5-dc2c-4952-9da6-73d4b09b6a4b/57038661983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5197db-3fcd-42ca-93a0-78a4be9c47b4/are_braun_thermometers_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e6bf00-4e05-441d-952d-516f44594ebb/muvefeges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29229e3c-9c45-4210-9cf7-24cbf309fe4f/66705067046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5dca08-c378-43d1-afe2-e7d5dcff3ba0/how_to_reset_brother_dcp_1510_replace_toner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db90cfc8-b142-48db-b334-cd5200215814/lydia_davis_break_it_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1726ae1c-455a-4c48-a579-30d8b884ae39/who_moved_my_cheese_message.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_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 5568 bytes
SHA-256: 93413e16c84fbcd0b1b943ab1a0958eb1c784b653c755b9e76d05359966be631
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 10712 bytes
SHA-256: 360ddc4c00dff7f8d0db22aed57028003e3e4c58403c5694fe801b64222365ed

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