Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a378184c2181cb…

MALICIOUS

PDF

81.0 KB Created: 2021-01-22 19:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 97bbc8fe87b05abf4bf66a0bd468928e SHA-1: 7a9378b49f483126caadb59d1265f5bf52ce026f SHA-256: 57a378184c2181cb300181b9a6ab79db734d6dc47edf969f9bd132c955bda567
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and part of a link farm. The document body, though heavily obfuscated, contains text related to 'Instagram logo black and white text' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to disguise malicious links. The numerous embedded URLs, including one pointing to a known malicious redirector, strongly indicate an attempt to lead users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://ggtraff.ru/wb?keyword=instagram%20logo%20black%20and%20white%20text In PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/bijapigebifuduxom.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/jbSHtjg/tamil_meme_creator_app_free_download.pdfIn PDF document text
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/c8f8b.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/teruliluz.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/teput-pigezekufop-sasakezajo-xujejuwozuwenav.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/MJjbFOt/73735198106.pdfIn PDF document text
    • https://rujurujubawupof.weebly.com/uploads/1/3/0/9/130969172/4569244.pdfIn PDF document text
    • https://lexabebuwapo.weebly.com/uploads/1/3/1/3/131383838/vinekimef_dopefen_sujelo.pdfIn PDF document text
    • https://buxarurusej.weebly.com/uploads/1/3/1/8/131856129/fc7e9.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/xatolilazakun_nojixumikudaxom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5ff9efe93e8e6.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/viromibukoleliw/action_verbs_vocabulary_matching_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/vegas_crime_simulator_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/amplified_bible_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/whatsapp_gb_2019_atualizado_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/nidokudataredanibesew.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 5652 bytes
SHA-256: 41868ee6f4e4340f92b183a6de41cd3136ec972a9a77135d6280741aa0183ad7
font_02_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 2368 bytes
SHA-256: 2c3284ac6ef7bd206aae4b51dfa5f38aa56e02205762d84d5907730e7a68a469
font_03_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 11084 bytes
SHA-256: 15adc24b60e6b57dc181032f01fcd731f5466db1bd3730f440cbd006f702af0b
font_04_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 16548 bytes
SHA-256: eff3b782edb688d7ecc738c430d1d41af18e2d841581081a5c98927f17fc7ed0