Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25d5371978dc418…

MALICIOUS

PDF

73.2 KB Created: 2021-02-21 08:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 962c32c7c522ca158aa65a0f390aa069 SHA-1: 4899e21be05cb203100b3f183b590c1e857d9937 SHA-256: e25d5371978dc418d6876f8c2bcf903e50897f1fb07bf4693fd1470e7560eb6a
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links, likely for SEO poisoning or to redirect users to malicious sites. The presence of an external URI pointing to 'bologen.ru' suggests an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=sas+interview+questions+on+adam PDF link annotation
    • https://vetigepar.weebly.com/uploads/1/3/5/9/135989985/pirizekararifiketev.pdfIn PDF document text
    • http://lafafojazepu.22web.org/discovery_model_engine_kit_instructions.pdfIn PDF document text
    • http://rawenspant.online/tevoduzepuxuzocj001.pdfIn PDF document text
    • https://cdn.sqhk.co/panuwatosim/ijid2ge/59469393063.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/dividing_complex_numbers_worksheet_keycvql9.pdfIn PDF document text
    • http://wosurijegu.22web.org/41628592386.pdfIn PDF document text
    • http://feseburowikuted.22web.org/congo_square_sheet_music.pdfIn PDF document text
    • http://nadahul.ru/systemic_lupus_erythematosus_management_guidelinesff6zx.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/32doSIM/kexudizezamu.pdfIn PDF document text
    • http://fitit.space/70225992233vqwbl.pdfIn PDF document text
    • http://0fruit.space/radio_online_clube_fm_brasiliaqc9t5.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/mqghngj/eric_church_new_song_2020_lyrics.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/setikizo/auto_answer_skype_for_business_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/artemis_hospital_gurgaon_test_report.pdfIn PDF document text
    • http://gazunobopa.epizy.com/jejusik.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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 5320 bytes
SHA-256: 426d75a9bec4f95af556d1cb109d0ca509ee3753b4031f7aa2421959ade9202d
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 10440 bytes
SHA-256: 9f7cdba59101d887d8af6880f946cc21bb3a8ad1e8dc4ba6f60360bc23e93e0c

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