Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc52ad99c8d92c0c…

MALICIOUS

PDF

92.8 KB Created: 2021-02-20 23:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bde5bd9c1eec6eee1f1d2dbde05d11b9 SHA-1: c3871f0e270b67522c29353389351acb7712dd12 SHA-256: dc52ad99c8d92c0ccd65ef730926ff9ebcbdaca8fa12249c1733b2dc5d799b29
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with 'https://maypoin.ru/123?utm_term=what+is+the+order+of+pemdas' being a prominent example. This pattern is often used to redirect users to malicious sites or for SEO spam.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=what+is+the+order+of+pemdas PDF link annotation
    • http://damvglaz2.xyz/short_natural_hairstyles_2019_black_female_over_50ymcfz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_6010c7f05581d.pdfIn PDF document text
    • https://kekufakaxuw.weebly.com/uploads/1/3/2/7/132740700/tikesuwoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_60276301a12a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_600f47206e5d5.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/hfLhjpz/order_contacts_online_with_unitedhealthcare_insurance.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/fakifazijavot_sipelomogop_basigovupebaxo.pdfIn PDF document text
    • https://zudibuliri.weebly.com/uploads/1/3/5/3/135319562/nonufojinewi_lefonobakemix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5ffcbb424b105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5fd07762c58d8.pdfIn PDF document text
    • http://magicwoolshop.com/why_is_number_pad_not_workingl5ryw.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/minabiwa/elsword_elesis_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/autocad_2007_free_filehippo_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/86811112176.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/bufodafexikuwubes.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/bluff_master_telugu_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/dixadixawelome.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_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 5264 bytes
SHA-256: d3a5d3d2de06d09fdb65fbe9e7603ded40119d8fe3ca2b729a4817362f9d1775
font_01_sfnt_off0001391d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391D 13268 bytes
SHA-256: dbc6be1c05ca31e7e8d451ac8c404743aca68b2b6116d9a6edc688d95fec2099

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