Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f41c84609dac65…

MALICIOUS

PDF

77.4 KB Created: 2021-03-12 01:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 12e3a8c74f7a8f65a6df21c0ee5f3f65 SHA-1: 941d209fb870f5f12ae381c09095f717e20faf79 SHA-256: 64f41c84609dac655980878c0685e86287e57e4f28b834b791837c84e6c93508
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 0.9997

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://zajinet.ru/aws?utm_term=how+do+you+make+lemon+garlic+butter+sauce PDF link annotation
    • http://yandex-delivery.cc/andres_segovia_asturiaspeecg.pdfIn PDF document text
    • http://belkwigs.com/digapagujejorebifpxfv.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ijihajb/stampede_pass_trail.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/n1gcrjk/1154058649.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/OhbKhep/fleet_battle_mod_apk_2._0._82.pdfIn PDF document text
    • http://digitalcalakk1.xyz/which_roku_is_best_for_older_tvec42y.pdfIn PDF document text
    • http://grizhoff.ru/439809165262ftqy.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/jdGchfS/translate_english_to_spanish_list_of_common_words.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/f4hgfjc/46915697430.pdfIn PDF document text
    • http://palawawez.mypressonline.com/newumeputebajex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c78c323-13b4-4c6a-a62a-1128068b9f25/nutrition_careers_without_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9f7a45-7f98-458e-9ed0-566e5a6bbc9e/valejugejitebokomufageno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5fc6c0-931a-4162-a66b-1f74ae8063f1/how_to_unmute_lg_flip_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab102ac2-f6b4-4806-9eec-34f17b176ea6/gazunavekuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2294c0-eb94-402d-a83e-b033eedb5f1c/sig_sauer_p365_iwb_holster_with_laser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535b1fc1-93c4-4547-9a06-11f62bb3e6b3/magumopijabikazowiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bc8d6f-83ac-4576-84e4-494986572e2a/87981748107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b90944-58f2-4cba-9757-5f944dc1d386/compare_greek_and_roman_theatre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23513431-4e62-4d1c-bfa4-c7798ec4e68b/seores_del_narco_gratis.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/75934561061.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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 5620 bytes
SHA-256: d7b64366d9ff869bd900f58615483b7528cce3fceadcaa9d36da9359a11c65a6
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 1884 bytes
SHA-256: 7f6fd28d882d404195ce7a718133bb3075ecafd23c4cf522997036800c192680
font_02_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 11128 bytes
SHA-256: 6181df2b4595c25b63d3685eae905c138057d5db6ecd6d7ebe9b228158c0d1a5