Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4034db17b3d2d8…

MALICIOUS

PDF

89.6 KB Created: 2021-03-16 09:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9e1afdc0f6e6bbb68d8f7599a7c6b01 SHA-1: 846027c4e614e95e70179a714308e4cc3be5589c SHA-256: df4034db17b3d2d81b9576f211471f3d1d4cb8661a8d6dba2ee2eee3e44d6c1a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/wix?keyword=what+goes+above+a+trillion PDF link annotation
    • http://bezoxafeme.iblogger.org/enterobacterias_en_alimentos.pdfIn PDF document text
    • http://menetufebev.22web.org/atoms_and_molecules_free.pdfIn PDF document text
    • http://procripton.com/pabopipogelofotonybd3t.pdfIn PDF document text
    • http://alcozerox.com/galunabatiboperopumi3xld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_5fd22729134a6.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/480648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5fc8142750301.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/how_to_see_f_distribution_table0ue41.pdfIn PDF document text
    • http://cmb-societe.com/best_country_music_videos_20199hx3m.pdfIn PDF document text
    • http://delayikapy.xyz/black_cartoon_characters_sweatshirtpzwa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_6005e4f2870b0.pdfIn PDF document text
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/a9bbd9a7c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_601e52c21a6ec.pdfIn PDF document text
    • https://mozawexi.weebly.com/uploads/1/3/1/8/131856146/bafalutarajaxafebik.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/vavale/pewitukeserizizezuzevaf.pdfIn PDF document text
    • http://pakilapawunafep.epizy.com/95844159883.pdfIn PDF document text
    • http://kipijitifexus.epizy.com/getamafonikoputopo.pdfIn PDF document text
    • http://bimilenalo.rf.gd/74598670721.pdfIn PDF document text
    • http://ponenasese.epizy.com/nordictrack_gx_4.7_r_recumbent_cycle_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/teboxexurujinu.pdfIn PDF document text
    • http://mobatujurital.epizy.com/list_of_adjectives_grade_4.pdfIn PDF document text
    • http://gusalixofunek.epizy.com/adjectives_worksheets_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/ripuwenowefewefatenonig.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_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 5160 bytes
SHA-256: c92ab6bca8d41ca0e3e4b04ffc8cdf57eb72eb748d8bee915c4dfd0e98fe7e54
font_01_sfnt_off00013171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13171 11776 bytes
SHA-256: 124d71a82c17f1679f0f46a3fbadc43832a664e6ba37bd76d29c7d8283518674

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