Malicious PDF — malware analysis report

Static analysis result for SHA-256 261701a8bd5325d6…

MALICIOUS

PDF

100.5 KB Created: 2021-03-31 22:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 002ea7161c44e9b6ccbbef2f8030faa0 SHA-1: e363393fa18cfdc6d4d59dc7ab378db19c478e67 SHA-256: 261701a8bd5325d696b8d1b85a0f4fb1c259425a15fa5f6531a699858244f081
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 0.9986

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://nipisod.ru/strik?utm_term=download+gratis+film+rudy+habibie+720p PDF link annotation
    • https://cdn.sqhk.co/furigelo/eF0iUyS/bricks_breaker_swipe_balls_game.pdfIn PDF document text
    • http://gobofan.iblogger.org/lagu_angling_sagaran_bahkan_jika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fe29c0fab44a.pdfIn PDF document text
    • https://cdn.sqhk.co/nazalugewu/bjgSrAt/55897822811.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/6ghgZgf/kings_granny_scary_mod_horror_house_escape.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/cztihjc/the_last_stand_union_city_security_failure_quest.pdfIn PDF document text
    • http://giftcard-sale.store/mafebevexuzifutetigex2m31e.pdfIn PDF document text
    • http://tegor.xyz/550740031524l7w1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_60510bf431243.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/supefuladaweguwoni.pdfIn PDF document text
    • http://stavki-na-sport.site/32955581526zl66u.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/birchwood_park_golf_course_guide.pdfIn PDF document text
    • http://prizinsta24.space/12847797819rhzxt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pomaxa/40323313292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbec3b2f-b5f5-4e1d-89a1-5f2c9987fb81/kafepofiloruvinatinolupuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab9a645-b5bf-4d3a-90a2-a4526b377402/68729715428.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/new_bollywood_movies_website_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/windows_10_reporting_incorrect_folder_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e4cf17-8342-4fd8-b991-c6757183ac91/91657989262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653609d5-7eec-44bb-bbac-c9103e4db2c7/love_story_taylor_swift_lyrics_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/batman_arkham_origins_apk_data_highly_compressed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b66e74-435c-40b0-a5b8-f3d3126dcbe0/tozelolutagena.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 19292 bytes
SHA-256: 4f90bc98d79bf130ab5e71e0d03e7e74a4a13c3f1285dc20c0ec2204e8d5031d
font_02_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 6144 bytes
SHA-256: 8ea17ef82925a5600928bfc03d93421593c802406db05dd4c559b9ae4334e727
font_03_sfnt_off000151e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E1 1996 bytes
SHA-256: ad0a2c8fc8636719c7d57f9facbdc048deff98c37e1f8377627ebbece5140f35
font_04_sfnt_off00015b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B48 11748 bytes
SHA-256: 265def2b70985280777ba0a3abab550411ab5e18b56a4d3bfb88b58d473874b1