Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c21eaefc3636e7a…

MALICIOUS

PDF

74.6 KB Created: 2021-03-19 23:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 96eae4bd852e9b6b1054acc3641454bb SHA-1: f487670c4915cd81c31abe6d090b827cce8ad8c3 SHA-256: 8c21eaefc3636e7acf4f0acee429a7a13c7d0eb877d1de45c67688364371c2e1
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links among many seemingly legitimate ones, aiming to evade detection.

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/award?keyword=upsc+cds+exam+syllabus+pdf+download PDF link annotation
    • http://jamonomikusuka.22web.org/nexovanamo.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/gewawexepenabumatkfr8t.pdfIn PDF document text
    • https://lijoliwaxodoxi.weebly.com/uploads/1/3/1/3/131398144/zosut.pdfIn PDF document text
    • http://litvinenko.xyz/gluten_free_snack_foodsoc266.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/72daeeb16c.pdfIn PDF document text
    • http://ujjjrrrrr.space/95317013992vm2sf.pdfIn PDF document text
    • http://hdvideo.design/7001763160aatbw.pdfIn PDF document text
    • http://scarcebook.com/a_friendly_introduction_to_numerical_analysis_brian_bradie_download_freempglw.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/9021072.pdfIn PDF document text
    • http://my-favshopg.online/free_online_multiplayer_zombie_survival_games_no_downloade3o5b.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/booster_pump.pdfIn PDF document text
    • http://huaweistoreukr.xyz/42556367685owh84.pdfIn PDF document text
    • http://ouily.xyz/definition_of_economic_sustainabilityola2k.pdfIn PDF document text
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/f0f4ab41eda52d5.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/9752813.pdfIn PDF document text
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/92208.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/mariage_d_amour_sheet_music_free.pdfIn PDF document text
    • http://lanasobewusek.22web.org/79367413145.pdfIn PDF document text
    • https://pupizotewijuguw.weebly.com/uploads/1/3/0/7/130775862/pofes-pevenapisiwaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badisaxutut.rf.gd/the_end_of_the_world_billie_eilish_cover.pdfIn PDF document text
    • http://gadomorepizof.epizy.com/architektura_komputerw_biernat.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_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 5600 bytes
SHA-256: 8ba3b52167e8f37581c7771e0e2f47e5b8a0b6f3b863cc921c8a9d1b153823e3
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 10116 bytes
SHA-256: ee9a6e884567562d96d8c54e7dadccaef9fa06a2ec3889efc67662da74834c62

Open this report in the interactive analyzer, or submit your own file for analysis.