Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4db59d2d1709524…

MALICIOUS

PDF

80.7 KB Created: 2021-01-22 01:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2a047ee475d8fadcbf3312dea83f50eb SHA-1: 8286cec08e840cdce0b42b53e7b9c24310ecf9ce SHA-256: e4db59d2d1709524bbab2bef81acae13688cc354fa459eb33442ba6bf98aa14b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru' and containing a 'comfort+aire+portable+air+conditioner+instructions' query parameter, suggesting a lure for users seeking information. The PDF's structure and the presence of many external links on disposable hosting further support its role as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=comfort+aire+portable+air+conditioner+instructions PDF link annotation
    • https://cdn.sqhk.co/libegavezu/iegiFib/64197931067.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/hVieFid/85653947550.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/h7gficQ/kefowumegorimud.pdfIn PDF document text
    • https://site-1177655.mozfiles.com/files/1177655/sawumegigilaniremejak.pdfIn PDF document text
    • https://site-1177982.mozfiles.com/files/1177982/ralaxuxevuvewu.pdfIn PDF document text
    • http://xigegojaliku.iblogger.org/hp_smart_printer_app_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/ihgQjgu/cs_driving_parallel_parking.pdfIn PDF document text
    • https://site-1176393.mozfiles.com/files/1176393/building_services_engineering_courses.pdfIn PDF document text
    • https://site-1176739.mozfiles.com/files/1176739/hitman_s_bodyguard_netflix_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/c5zjbih/terotikowiwomirafoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/duzokezubeka/UohT4Fb/robo_legacy_strange_robot_war_battleground_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/TRCOCXG/tiximupok.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/ffgjhfo/chicken_running_away.pdfIn PDF document text
    • https://site-1168145.mozfiles.com/files/1168145/munopedowutimur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwejozaz.epizy.com/airlift_full_movie_hd.pdfIn PDF document text
    • http://luwatejanif.epizy.com/battery_cells_in_series_and_parallel.pdfIn PDF document text
    • http://sixijoras.epizy.com/36754403620.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_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 5344 bytes
SHA-256: 015cf059a25ef80a96c5e2e98b1431f6fb39105aae8aac6b50bc71b06dd08597
font_01_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 10936 bytes
SHA-256: 9ce4b333686a63391e7be7b7d955dc30eec8df58e5d1c16795950236ba9a69a8

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