Malicious PDF — malware analysis report

Static analysis result for SHA-256 8718dcbe12732a7a…

MALICIOUS

PDF

70.1 KB Created: 2021-03-18 19:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cd5a16db48cac185eb2f9259acee50b6 SHA-1: 6ff864be4e1398de6fd104cddccde8e65f6f530f SHA-256: 8718dcbe12732a7acae9db7ea9f518b370796715f5dcb60d815de3b885f8ebda
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a phishing or scam operation. The document body, though heavily obfuscated, appears to be a lure related to 'chemistry vocabulary review answers', which is likely a pretext to drive users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/wix?keyword=chemistry+vocabulary+review+answers PDF link annotation
    • http://kadazid.22web.org/the_veldt_movie_watching_guide.pdfIn PDF document text
    • http://deutschebank-meine.com/vanilla_extract_nutrition_informationjcyf1.pdfIn PDF document text
    • http://stepka2016.xyz/royal_marine_slang_wordsrxb7z.pdfIn PDF document text
    • http://private-channel.site/42859603912theds.pdfIn PDF document text
    • http://gokojemisivuf.22web.org/bluestacks_4_pc_free.pdfIn PDF document text
    • http://help-service-support.com/81290062713ofxyj.pdfIn PDF document text
    • http://maslovauto.ru/birthday_invitation_card_background_templatese2dz.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/tabuna.pdfIn PDF document text
    • https://temoxemotedi.weebly.com/uploads/1/3/4/5/134599163/c9899.pdfIn PDF document text
    • http://tidemelewofu.iblogger.org/zimufizotibotilagidejex.pdfIn PDF document text
    • https://juxejiwivila.weebly.com/uploads/1/3/4/7/134713499/10f8e60315.pdfIn PDF document text
    • http://pasetbs.xyz/pofoxoso9nj93.pdfIn PDF document text
    • https://pabarasoziraw.weebly.com/uploads/1/3/5/3/135324669/a6ae4c50a3fa.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/veperepagog.pdfIn PDF document text
    • http://ductsunlimitedins.com/epson_1430_ink_pads_reset_utilitypu2t9.pdfIn PDF document text
    • http://mscredit.info/70180128714muyck.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/ruzituj4wqka.pdfIn PDF document text
    • http://uchebnoe.website/zugatokafebnztv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekedoxe.rf.gd/canada_pension_plan_retirement_application_form.pdfIn PDF document text
    • http://nanesipub.rf.gd/guidelines_on_profit_equalisation_reserve.pdfIn PDF document text
    • http://zanobunu.epizy.com/legetevogowalama.pdfIn PDF document text
    • http://jibovofafef.epizy.com/estudio_de_factibilidad_ambiental_de_un_proyecto.pdfIn PDF document text
    • http://pebuvika.rf.gd/bamefomun.pdfIn PDF document text
    • http://wigamewekafon.rf.gd/gods_wisdom_for_a_mothers_heart.pdfIn PDF document text
    • http://lowadof.epizy.com/jepoponuje.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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 5340 bytes
SHA-256: 50e8d822f19f187516b09eea32405821a375527cf0ef05dd7235b93738d06e46
font_01_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10192 bytes
SHA-256: 81955ca5eb07c07c42fe5551946d2712c4dadb8ac2bc48547b61581e943104a4

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