Malicious PDF — malware analysis report

Static analysis result for SHA-256 01570fe983709cf5…

MALICIOUS

PDF

75.2 KB Created: 2021-02-21 09:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd4f9125bbf0065bb17a44e2e6c11f04 SHA-1: 94e5113c23afbe52ac1f951de4a4b1c300b59b8e SHA-256: 01570fe983709cf57177f388f8b298d34db3f355c42379637fea102101f9f73b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to academic or informational content, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=how+to+cite+words+in+other+languages+combined In PDF document text
    • https://cdn.sqhk.co/goduwonon/eWXhfhi/92311156971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366321/normal_5ff28390c5233.pdfIn PDF document text
    • http://zuvels.xyz/bovikukopeluwumikbenu2.pdfIn PDF document text
    • http://wejnpowk.space/80178528849h3w3r.pdfIn PDF document text
    • http://pegajopakazo.22web.org/determiners_in_english_grammar_exercises_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/hdjaEfN/top_100_country_songs_today.pdfIn PDF document text
    • http://vugezaselefobop.iblogger.org/antietam_battlefield_guide_test.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/4aogi04/the_bowling_family_tour.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5fd79cf89e0c0.pdfIn PDF document text
    • http://pidejofejan.iblogger.org/81433882016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454811/normal_600a5cbc06117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_60183e8455cbc.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/nhdhghb/perfect_piano_mod_apk_vip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_601ddf13c07b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_601afffdba973.pdfIn PDF document text
    • http://jobauthor.online/lesson_6.1_practice_b_geometry_answe23v0f.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/02jjAU7/80750510458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5ffae7f0d90a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renowujemunada.epizy.com/june_18_2019_living_environment_regents_answers.pdfIn PDF document text
    • http://ropedeni.epizy.com/dinojekolowanubazokeput.pdfIn PDF document text
    • http://depevatumelo.epizy.com/jeretelafeguvorit.pdfIn PDF document text
    • http://bojibag.epizy.com/sipetomuvezopiv.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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5544 bytes
SHA-256: 1ac3e72650f194648084979dd804e5b2e16224c79501818de4f194a48a03c6df
font_01_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 10308 bytes
SHA-256: affbb432b28401a6f6b52dc8ab4a437f08df5184387fa13be2a368657ce40f12

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