Malicious PDF — malware analysis report

Static analysis result for SHA-256 710f3865dd01a5f4…

MALICIOUS

PDF

67.9 KB Created: 2021-02-19 13:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 450a4ce3eaf9d806b2856608dcc945e1 SHA-1: 9cf53750845483024df2990e022490b85d9aac5f SHA-256: 710f3865dd01a5f41a94f27779254f3b43fd3eb9b1e64f24eedf1458e339c0ab
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 0.9998

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://bologen.ru/123?utm_term=dell+inspiron+1720+ram+slots PDF link annotation
    • http://bebolekuku.22web.org/environmental_and_road_safety_awareness_book.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/NLjaYvF/masterchef_fragman_71_bolum.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/cl0iikr/movie_music_ringtones_telugu.pdfIn PDF document text
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/pururipibakixe_mesupofiwadan.pdfIn PDF document text
    • http://namunogetivij.iblogger.org/smartsheet_add_logo_to_form.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/B5OiggI/proton_bus_simulator_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/ihgghhb/neon_yellow_long_sleeve_running_shirt.pdfIn PDF document text
    • https://webuseki.weebly.com/uploads/1/3/2/8/132814302/sazowaluvuzoxikago.pdfIn PDF document text
    • https://cdn.sqhk.co/lutugivaje/fibXW9Q/w3schools_css_animation_delay.pdfIn PDF document text
    • https://cdn.sqhk.co/lofujumixas/jjHgcic/addon_mutant_creatures.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
    • http://kugesiv.epizy.com/29436692550.pdfIn PDF document text
    • http://pepiretivixu.epizy.com/29546168550.pdfIn PDF document text
    • http://tedonipevafipe.epizy.com/96709893891.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/16059388511.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_off0000bd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD85 5160 bytes
SHA-256: 7924247cca42335e1dcf2aef596fe6ebf6217a94b659c5adb24b43183457d243
font_01_sfnt_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 11060 bytes
SHA-256: 7fb1a86433d20115a6051ce749606e81d268929dfc29518bacdf3a194b3df1b7
font_02_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2