Malicious PDF — malware analysis report

Static analysis result for SHA-256 422837e107a3baf4…

MALICIOUS

PDF

84.3 KB Created: 2021-03-20 19:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 586626177ab9ad743adb0565f380e886 SHA-1: 364765a845b61a6aff1181316f94ece961008e4c SHA-256: 422837e107a3baf43b49a98bad40b56abc1fdab4cafe5580ee7dfaabeb78f943
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate the document's purpose is to drive traffic to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/123?utm_term=simple+vehicle+bill+of+sale+template+pdf PDF link annotation
    • https://cdn.sqhk.co/jurugaguvedu/ianhihd/47602745825.pdfIn PDF document text
    • http://helplnstagram-confirm.com/bemefux4vj9r.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/resistance_tube_exercises_for_seniors.pdfIn PDF document text
    • http://zolepop.mypressonline.com/a_moveable_feast_book.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/1127531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fd071582886c.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/RTYiguT/klondike_solitaire_free_download_for_mac.pdfIn PDF document text
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/3495779.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/hiVjjhb/92863063242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423728/normal_5fd2c224b39f3.pdfIn PDF document text
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/200197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_6004beb851d27.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/59014687828.pdfIn PDF document text
    • http://uscreditcheck.info/56939590308smyri.pdfIn PDF document text
    • http://stavki-na-sport.site/how_do_i_put_my_sonos_in_pairing_modeglsnf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449001/normal_5fcc69e6df4dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fccda04491ca.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/gjpyQhe/69886331728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugifer.onlinewebshop.net/how_much_notice_is_required_in_a_month-to-month_tenancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725cefb8-c13f-4f97-b220-45f60f92cc6c/nugigolabunaxadekewif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27663dae-b3b9-47e8-92d0-c493bfca9c73/whirlpool_duet_ht_washer_drain_pump_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e7ba04-0b87-4e6b-a56b-1921a80971f2/dot_national_highway_traffic_safety_administration_hs-7_data_is_required.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23233c5f-54ec-4b2f-a164-ddef340b94eb/52655360315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e0d305-a9cd-4a87-a813-8507a708ade1/how_to_make_black_color_mixing.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_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 5600 bytes
SHA-256: 28a3b43961e2564e06d274c3596842bf26fab722b90ffc32691f921805a73481
font_01_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 11040 bytes
SHA-256: d14d94e039b9668ee564c0a000aa4a7a5b467ef18b81bfbb132bb35fcc4e9af4