Malicious PDF — malware analysis report

Static analysis result for SHA-256 712d77c10bfd4ba2…

MALICIOUS

PDF

70.5 KB Created: 2021-02-25 12:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc030d25dbf50e3176d2ce2e10d6f662 SHA-1: fa8377bfa2b77536e8f9d5517718770cf4bd3342 SHA-256: 712d77c10bfd4ba2e6317120f3aff7ed4ba20af7f66598fbd1098d3dc71852c8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting, specifically pointing to 'http://cethq.xyz/43721287230os8il.pdf'. The document body, though heavily obfuscated, suggests a lure related to 'static electricity worksheet answer key', indicating a potential phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/123?utm_term=static+electricity+worksheet+answer+key PDF link annotation
    • http://cethq.xyz/43721287230os8il.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5fdb7ec64bc6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_602bb0a20f036.pdfIn PDF document text
    • http://want-seo.ru/interview_vocabularydek22.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/UXFgf8b/picshot_photo_editor_pic_collage_maker_filter.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/ncEjaf1/fosonani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_600a9f844ef91.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/cuantificacion_de_proteinas_por_el_metodo_biuret4w8ta.pdfIn PDF document text
    • http://100naturals.fun/bivepilet4u6p.pdfIn PDF document text
    • http://gufutaca1.xyz/un_curso_de_milagros_leccion_150lubhq.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/52336854040.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/zL5RjjE/amazon_fire_stick_cricket_world_cup.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/jitimesolagun/chirugali_veechene_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/what_is_the_characteristics_of_an_argumentative_essay.pdfIn PDF document text
    • http://rigutogivopum.epizy.com/c_winform_stored_procedure_mysql.pdfIn PDF document text
    • http://giraxajo.epizy.com/graco_nautilus_snuglock_lx_3-in-1_harness_booster_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/62397724210.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/38326950151.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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 5248 bytes
SHA-256: abe588b75e98d0491a0aaaaf7514771dfc3c3890ed4776de98eede2d79dbd728
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 10100 bytes
SHA-256: bfc84e34e956081ab0ffdca1dfe4a5f5a6b820bee18e9a7d4249858055d46e2e

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