Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8918b716f5c4e5e…

MALICIOUS

PDF

82.7 KB Created: 2021-03-24 01:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e6e90a1504965134c8f26b280aa16d25 SHA-1: e2ab1bacf931cc4ffab0b294c057a4bc71116779 SHA-256: c8918b716f5c4e5edfaafa53d41f816fd0664b64475f841891ba7d3c568596d2
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=how+to+install+conexant+audio+driver+windows+10 PDF link annotation
    • http://vulupexemuv.iblogger.org/hp_bios_beep_codes_3_long_2_short.pdfIn PDF document text
    • http://gemosugobez.22web.org/ice_fishing_guide_service_near_me.pdfIn PDF document text
    • https://vasaxufunibax.weebly.com/uploads/1/3/1/6/131606743/xapiv.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/5613604.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/wudibirewuduto/12256543834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f57328-e059-47c4-b6b2-1b6d1d385c9b/vatutiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6214e7-bedd-4f5b-9063-345b37e06193/2000_polaris_scrambler_400_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/68773680696.pdfIn PDF document text
    • http://sabozet.epizy.com/27322455465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0567b7-c779-4714-8435-b9ab260f354e/how_do_i_recover_my_facebook_password_without_email_and_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ed823f-ceae-4dee-8d13-a19ae9a00b47/28448810282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ebe3b0-c05f-4218-b118-5e17c820be9f/mary_poppins_supercalifragilisticexpialidocious_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/puxizogilumanap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea063645-2505-42f0-8d57-9551bdec98be/46822305877.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/math_practice_book_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c97ef997-1007-4af9-9593-1b0e93206128/canon_mx890_scanner_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09fcafd7-63b2-48b0-b5c1-48946cf79391/best_countertop_convection_toaster_oven_2020.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/bevifosulimaxobade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d351ca-bad3-4113-8779-48e70d225c24/zabatokus.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/teruluwuri.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/gmat_official_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/jkbose_date_sheet_10th_private_kashmir_division.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b706d51-dd56-4ff9-835b-605a3ccb5655/my_lg_front_load_washer_is_leaking_water_from_the_bottom.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/how_to_use_calligraphy_brush_markers.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_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 5308 bytes
SHA-256: 0aaf1796c551797202450fb9aecea19f079b045344b34cd2abed9f1418c8274d
font_01_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 10388 bytes
SHA-256: ebe4b9b298ef3cce8451a8e4dcb79361e68e9926fc29445042f2efa912d788f2