Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3eb20c47549054…

MALICIOUS

PDF

81.4 KB Created: 2021-02-18 11:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: db6f4698dd5630dc1445302de59dcce3 SHA-1: ee6b923303049c44f69642086807dd65a7f022ee SHA-256: 1c3eb20c47549054357ceab55bd58e582dffcd648eff1ce51d54803325563475
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it contains malicious content. It embeds numerous links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text fragments related to 'The last lecture book quotes' and the wkhtmltopdf application, suggesting a lure to trick users into clicking on the malicious links. No scripts were extracted, but the presence of embedded URLs and the heuristic firings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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=the+last+lecture+book+quotes In PDF document text
    • http://legrand-spb.ru/genaxo6wo5h.pdfIn PDF document text
    • http://sanamikegimelab.22web.org/webassign_answers_calculus_1_2._7.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/oAQeShd/fedex_ground_operations_manager_job_duties.pdfIn PDF document text
    • http://natorg.fun/super_mario_bros_3_pc_originalredm4.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/clhgjiv/foosball_cup_world_apk_mod.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/xifevudusozipod.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/793824515785uxka.pdfIn PDF document text
    • http://storedubai.shop/ordering_of_decimals_worksheets_for_grade_5edi6q.pdfIn PDF document text
    • http://pravagims.net/chemistry_lab_manual_class_9ogiet.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/hdQhgwK/14265533752.pdfIn PDF document text
    • http://exemplpusj.com/linksys_e1500_router5mbkv.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/19ff4c.pdfIn PDF document text
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/3832294.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/SKbjtwW/xogezabakidowigedatemibav.pdfIn PDF document text
    • http://topcreditmonitoring.info/al_bayan_arabic_font_freeuigsv.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/samexepopizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gomupinoteripa.epizy.com/74363157015.pdfIn PDF document text
    • http://dojiseb.epizy.com/celine_dion_titanic_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 4896 bytes
SHA-256: 1cce857b53c95f539ecd200b87f6881a07714e5a0844555db915bfe6d12e5c4c
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10224 bytes
SHA-256: b43bc2e153599776e9c61955efb3a57c641cb929084de315652f305dc22be67d
font_02_sfnt_off000129f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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