Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c68bea838998cde…

MALICIOUS

PDF

147.9 KB Created: 2021-05-17 15:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 973765d9e67d7cb75e1246ef19cb5701 SHA-1: c4b28b35e5dbcf54f2a28de78a1ee7c90bfd1a71 SHA-256: 8c68bea838998cde5326423adbc542b0c05f99de283faae1189e5d5d95464445
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 0.9987

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://baarspo.ru/strik?utm_term=does+illinois+tax+military+retirement+income PDF link annotation
    • http://ch-redirect.icu/9602528822219twi.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/kojonekepijodopubukudijv6wu8.pdfIn PDF document text
    • http://betafiwes.iblogger.org/altivar_61_programming_manual.pdfIn PDF document text
    • http://dkblogin-de.com/nerunewolonodiidlu3.pdfIn PDF document text
    • http://persequen.com/fire_rated_rockwool_battsh15d3.pdfIn PDF document text
    • http://sandwichhq.club/dodge_ram_uconnect_12gkxq3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3790d3f4-8db3-40c9-a1a0-7a952fb4d5bd/problemas_de_la_educacion_en_mexico_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33899283-5f21-4af9-b342-072ddab95e1f/revolal.pdfIn PDF document text
    • http://fuxozodox.epizy.com/73829827009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b86195-b41c-436d-834d-9ebf4699a6a3/bofufax.pdfIn PDF document text
    • http://safoxaw.rf.gd/listening_skills_exercises_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/popular_songs_fake_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/gozet.pdfIn PDF document text
    • http://wuduzukatej.epizy.com/96196784082.pdfIn PDF document text
    • http://gapisamiwabu.epizy.com/guvire.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/pulapapenogofuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82bc9a91-3bee-49e3-90f7-25a1bfda6952/niporuzodibode.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/8683475011.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/disneyland_theme_park_map_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/kenimozajilasujuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/admiralty_charts_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19033777-f42c-4c2a-a741-436b48561ac6/how_to_thread_a_kenmore_sewing_machine_model_5186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f706e0c9-08e6-4290-8d9e-cfe215ac2d7c/patat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8CF 4904 bytes
SHA-256: 2b5d636a20cd8c3e45a660195c8ae68207bac77e7c48d077de13fff590143101
font_01_sfnt_off00020961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20961 11828 bytes
SHA-256: f801f307c7ba71951a020698b90064fdca74b1af1750780ebe0d5b34c4a6a8ba
font_02_sfnt_off0002319f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2319F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71