Malicious PDF — malware analysis report

Static analysis result for SHA-256 a875a4fb409c08c2…

MALICIOUS

PDF

99.4 KB Created: 2021-02-21 03:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 82cedad46bcceb03d2d969afb57d8a75 SHA-1: 7fe43fe55bafcd0f9660610f6c4db99a6376a75a SHA-256: a875a4fb409c08c2b5b62933e9b8ceaeb6b76e3e90f8f745e2bc3c21dc3bc63f
244 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/wix?keyword=dioses+egipcios+anubis'. Additionally, it exhibits characteristics of a link farm, with numerous external PDF links hosted on disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan.

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
  • 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/wix?keyword=dioses+egipcios+anubis In PDF document text
    • https://lugafowak.weebly.com/uploads/1/3/4/6/134647172/namepafej_wawunimamag.pdfIn PDF document text
    • http://lazadacostumercenter.com/exercises_if_clauses_type_1_and_2kvnzz.pdfIn PDF document text
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/bivosulez-dijutufajijok-kavanugagewig-wesubapijevif.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/sopin.pdfIn PDF document text
    • http://jugatilewe.22web.org/giwajixo.pdfIn PDF document text
    • http://matcobzor.ru/paxaruxotidurowamabelharzz.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/2959845.pdfIn PDF document text
    • http://intereriia.com/ruwatczxur.pdfIn PDF document text
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/14aec6dddeb6f.pdfIn PDF document text
    • https://gitutibilaralib.weebly.com/uploads/1/3/1/3/131384503/kidizeka.pdfIn PDF document text
    • http://my-favshop.online/oldboy_2003_english_subtitles_downloadrbyxw.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/zorifikepinotof.pdfIn PDF document text
    • http://creditscorecard.info/moredegutigonumvvr2u.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/dashboard_html_template_nulled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulaguwiz.rf.gd/mujujusefefeguteripa.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/cornell_notes_powerpoint_template.pdfIn PDF document text
    • http://rezapemez.epizy.com/78910755949.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/anyay_abichar_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/alien_shooter_mod_apk_rexdl.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 7084 bytes
SHA-256: 4b85039983787a8342ba35b312552ccdb44e8fbe08ba3f287bb1a9c72f180a5d
font_01_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 5112 bytes
SHA-256: 30a4c08f634892c9217c75f140705c654e1ac96697173594db65d84b6861eda8
font_02_sfnt_off00013f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 12764 bytes
SHA-256: cf22a2046961d458fe431dfafed584e2d8d6052c87437b824893439efb58e2b6
font_03_sfnt_off00016834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16834 16220 bytes
SHA-256: 19770e74ac146496f5e3e8b897cac5737d72045adf988d08c066f4a29952341e