Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ac0e5ad7d3fcda…

MALICIOUS

PDF

72.9 KB Created: 2021-03-23 00:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 32f6d4da98696382cfcb746d50f85a87 SHA-1: fe366b38d09072f9e4c829fd0dca3892c5afec6e SHA-256: 57ac0e5ad7d3fcda3e1c68bd345c028285112fdb2f3141e306b3034272c7d303
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'worksheet answers', aligning with a phishing or malware distribution strategy.

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
  • 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://soxebez.ru/123?utm_term=the+electromagnetic+spectrum+worksheet+answers PDF link annotation
    • https://gumozudisi.weebly.com/uploads/1/3/0/8/130814032/liwexezumexigazivexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_600a607fcfe03.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/ahdAJeW/68447548160.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/blur_image_android_glide.pdfIn PDF document text
    • http://bullbananavannaone.xyz/soundarya_lahari_telugu_with_meaning_free_downloadndphq.pdfIn PDF document text
    • http://garantiya62.ru/how_do_you_write_a_summary_in_apa_format9n2ia.pdfIn PDF document text
    • https://cdn.sqhk.co/dokiladigana/2jbKjb6/dragon_robot_2_hack.pdfIn PDF document text
    • http://goldenframecollision.com/sig_p226_40_sw_15_round_magazineyz7nf.pdfIn PDF document text
    • http://natural-shop.info/how_to_alleviate_lower_back_pain_while_pregnanty7ger.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/fexulosozoge_mojizogiditino.pdfIn PDF document text
    • http://walifevapeju.22web.org/autacoides_y_eicosanoides.pdfIn PDF document text
    • http://aov.one/zagupalipo7mo9c.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/jbVrUlo/92729861846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403822/normal_60093e7c97d89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://papaxepetok.epizy.com/usps_change_of_address_form_3575.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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 5452 bytes
SHA-256: 0e0ed537d4dbefbd5f7325fa642d45b0b8cbc0dd9dd0c9ab3f6c92e7f95ec277
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 10380 bytes
SHA-256: 41227343b7fc836dc102bc703096914938cf962963f539ce3f739715d354d783

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