Malicious PDF — malware analysis report

Static analysis result for SHA-256 978d7a1a5924ec94…

MALICIOUS

PDF

77.1 KB Created: 2021-04-04 08:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad9e008ec84a556be63c3d5bd4d82eaa SHA-1: dd7a34c59002d23743c83c7ff8582d01cb80c7db SHA-256: 978d7a1a5924ec9420825c0b149c48e6aace83800f69756667d898365c195bc1
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 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=how+to+read+a+barcode+by+eye PDF link annotation
    • http://anrostore.ru/66951669800vjnwz.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/gj6Mthe/hockey_game_appetizers.pdfIn PDF document text
    • http://fifamarketbot.com/46259476164bq4fd.pdfIn PDF document text
    • http://jewidexomemivib.iblogger.org/omen_of_the_stars_book_4.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/15bjeib/falling_in_reverse_lyrics_drugs.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/muvatagikulupov_topogifitejikuz_korapixakusuj_dujolavusin.pdfIn PDF document text
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/43d765d2ee6c.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/8508344.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/srjeiha/folder_status_offline_background_sync_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/igjjQgi/wordscapes_level_8253.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/hcKFNib/electrician_apprentice_program_dallas_texas.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/filinomaduk.pdfIn PDF document text
    • http://online-bestshop.xyz/ccma_forms_section_143enmvb.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/9856201.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/pevuwarobuvowa/47227069715.pdfIn PDF document text
    • http://toridefe.rf.gd/collocation_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/shooting_games_apkparadise.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/numuwejexonigono.pdfIn PDF document text
    • http://denitotogu.epizy.com/splash_screen_with_animation_in_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2529cf01-6eb0-4f7b-a83d-864f1315c148/nazanufurav.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/jumorurujakoxudeviwebov.pdfIn PDF document text
    • http://jijetebum.epizy.com/63415455422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf0e6d9-49f7-4622-9c66-59e58c46e6d6/why_is_the_us_light_orange_on_my_arris_modem.pdfIn PDF document text
    • http://padedojuwuler.rf.gd/bixupukorirofunudunire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fd940e-a1c6-4f18-9c94-5cb5f63387ba/our_man_in_havana_1959_subtitulos_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/15572826043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5aea8b-8914-49c0-994d-baeb54a51cee/wendys_hamburgers_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244a7e08-dabb-4c12-89a0-5223115341e8/semumivizegafin.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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 5016 bytes
SHA-256: 0b12860f97feb7b8166d697b41ad54622459e06f280219efaedb69a0b69368af
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 10736 bytes
SHA-256: 178d73e867909201482aa2f8fc1b2a693290a7d3e828fb134d0397419bd80f31