Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95adb5e0ff39504…

MALICIOUS

PDF

79.6 KB Created: 2021-03-12 12:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 01c3ab8af7e8323da93b2197aba1097d SHA-1: 101aa78c8b931bfef37c2fad4eb591e65693efd6 SHA-256: b95adb5e0ff395045bdb73b9408e0d5d31a694fe14a9dd4fdcae997e0b26895b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. ClamAV and ML classifiers also flagged the file as malicious, suggesting it may be used for phishing or to distribute further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://maypoin.ru/award?keyword=blood+pressure+chart+age+wise+pdf PDF link annotation
    • http://7lessons.fun/the_exorcist_book_vs_movie_redditz8ctj.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/bigipur.pdfIn PDF document text
    • http://widarexidifazi.iblogger.org/coalesce_postgres_performance.pdfIn PDF document text
    • http://accface.in/zekidowodugavalai24ea.pdfIn PDF document text
    • http://mestorating.ru/prentice_hall_gold_geometry_3-3_answtvlxb.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/mugakevofigip.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/fapabuk.pdfIn PDF document text
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/dojumakubulokakiwi.pdfIn PDF document text
    • http://kengoru.space/algebra_equations_worksheets_year_9kvzmq.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/annotation_guidelines_for_middle_school.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/firati_zabuwok.pdfIn PDF document text
    • http://ewwe.space/70103440752ci12x.pdfIn PDF document text
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/poxuwexolotadekibe.pdfIn PDF document text
    • https://zulijijala.weebly.com/uploads/1/3/0/7/130740393/713f3fb8a1ba4.pdfIn PDF document text
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/sazodomifuk.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/jopivuriva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pipiwilevo.rf.gd/vaar_bhagat_singh_video_song.pdfIn PDF document text
    • http://xuzatazuji.epizy.com/lugubalagumarilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7e4c22-4b78-494c-897a-63e74be4fe11/what_does_title_mean_on_1096_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c55ba12-036b-4763-b650-8f8f69615265/68752375398.pdfIn PDF document text
    • http://xagadikexebixa.epizy.com/placa_dentobacteriana_en_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d9bcdd-c8a2-4fbf-afb0-42adc5115109/dabukibovagupokonusa.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_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 5556 bytes
SHA-256: 37331608bfcefa32349275f771bd324e7eec88960954f558cec3081d612e9641
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 10456 bytes
SHA-256: 489962247df9d3fdb33149e6287e87e3a2cdd5a82d26e5c2c96bb185c01c735a