Malicious PDF — malware analysis report

Static analysis result for SHA-256 77402b841e36f8ea…

MALICIOUS

PDF

88.5 KB Created: 2021-02-22 18:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b62435f543463c5977bf0bfdc90e6ba3 SHA-1: cf73106d720819f65204b6620b5983691db91198 SHA-256: 77402b841e36f8ea3288cdac7594dbe71faa7f21bd4a815789b568217e9340ee
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to external PDF documents hosted on disposable domains. One of these URLs leads to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=twilight+breaking+dawn+part+2+ending+jacob+and+renesmee In PDF document text
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/7339457.pdfIn PDF document text
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/fimur.pdfIn PDF document text
    • https://muxudopigudud.weebly.com/uploads/1/3/4/4/134490596/pevar_lijuradoba_gotezulax_davekuferozelig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_5fe87685a242e.pdfIn PDF document text
    • http://leyloften.online/christian_names_with_meaningvvd0x.pdfIn PDF document text
    • http://ueuniti.xyz/american_gods_season_1_episode_6_full_episodejhg8m.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/gurukanelif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_60338ecb89116.pdfIn PDF document text
    • http://xawinagolagiju.iblogger.org/building_information_modeling_software_list.pdfIn PDF document text
    • http://scarcebook.com/capitulo_2a_answers_page_31oumqv.pdfIn PDF document text
    • http://ejinaya.com/27517731618w5gri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5fe3adae7879d.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/4380054.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/mesoxisunutugawija.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/dobem_kakirunejet_fajezunefowev_tedibozap.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/dojirula_sixemexuresine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laneneloko.epizy.com/decimal_place_value_expanded_form_worksheets.pdfIn PDF document text
    • http://sazevaxorofezag.epizy.com/jemekileganedigazot.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/math_worksheets_for_middle_school_free.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_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 5940 bytes
SHA-256: cb34662cb29fa0f9510ad08a356921f5595375ed363642ecdf42936d161b611d
font_01_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 11964 bytes
SHA-256: d631a2bf2a696721c7a5007e5f04b0cd50de3ebfc1d39aca22f7ba61c1c345ba