Malicious PDF — malware analysis report

Static analysis result for SHA-256 815c16a1791d3d7f…

MALICIOUS

PDF

76.7 KB Created: 2021-03-10 00:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6aba662cbaa7aeb1d7b220a67ec781b6 SHA-1: 23d1bb2b5727172ccba6eb5b5709c7322efea3c5 SHA-256: 815c16a1791d3d7fe959b01cd7c7fb1a33104bd860524daf4a38f4ed8a7a8870
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics further supports the attack pattern of luring users to potentially harmful sites.

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://jottigo.ru/strik?utm_term=audio+technica+lp60xbt+stylus PDF link annotation
    • https://cdn.sqhk.co/wolanojijen/yPigfgh/medolegozefelaxopazux.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/kreg_jig_storage_box_plans.pdfIn PDF document text
    • http://subaxidubuju.22web.org/jensen_vx7020n_manual.pdfIn PDF document text
    • http://wobixoka.66ghz.com/78349985997.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/CrjeJib/karimekijasusap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_6039527378552.pdfIn PDF document text
    • http://timinome.getenjoyment.net/roxewozekagivilad.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/gfRehdH/tofuwisowuzopoxilotiboti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_60391c2870431.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/american_gods_season_1_parents_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_6000b66bf1ddc.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/ihAijiJ/jolteon_pokemon_go_pvp.pdfIn PDF document text
    • http://bamiluzigu.mygamesonline.org/how_do_i_love_thee_let_me_count_the_ways_wikipedia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff01b69d38fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiwoxofor.rf.gd/fjalor_shqip_gjermanisht_free.pdfIn PDF document text
    • http://bilalukaseka.rf.gd/what_is_the_most_accurate_finger_pulse_oximeter.pdfIn PDF document text
    • http://mevexunimapo.epizy.com/lokuvebudorekebovore.pdfIn PDF document text
    • http://mofibukuzoke.rf.gd/xariza.pdfIn PDF document text
    • http://lodonevubepivor.epizy.com/14288475931.pdfIn PDF document text
    • http://sapokumafunu.epizy.com/how_to_descale_cuisinart_dual_coffee_maker.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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 5660 bytes
SHA-256: 099bc6fcff71f37659c5dc42f900dc8c8e6cef05029d3e58d82602cae658503b
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 11212 bytes
SHA-256: 5b2b702a383f1d84d109a1740adda9619d057ba801cca152b92fba3258ad9818

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