Malicious PDF — malware analysis report

Static analysis result for SHA-256 a061cd77c920e34a…

MALICIOUS

PDF

70.2 KB Created: 2021-04-08 03:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e927db6b8e364e81af0a1a3ca04f4528 SHA-1: d7b17ba1a13abda5dba3a157379e6c2c19dbb780 SHA-256: a061cd77c920e34a0592014cfcdc90bbc7d93c42ef870e7025e62a715c0b14ed
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

Heuristics 4

  • 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://mezovuduw.ru/123?utm_term=prentice+hall+literature+book+grade+8+answers PDF link annotation
    • https://cdn.sqhk.co/wamedexipun/ggiejha/regal_cinemas_cda_id.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jJhc0Mg/ivan_the_gorilla_artwork.pdfIn PDF document text
    • http://max-lifting.store/what_is_the_quietest_wine_coolerwh1sm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5fdafbe09b794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5ff0ed9c070fa.pdfIn PDF document text
    • http://creditactive.info/dymo_labelwriter_4xl_labels_for_saledc55n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_604f6cd3a1c2f.pdfIn PDF document text
    • http://pubgmobiie.com/4759703693003rf4.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/cichhha/diy_road_trip_activities_for_tweens.pdfIn PDF document text
    • http://mmeueue.space/geluid_blaffende_honden_enj90n0.pdfIn PDF document text
    • http://euromarket.pro/dolores_cannon_conversations_with_nostradamusqwppw.pdfIn PDF document text
    • http://samelike.site/19382650204d3efc.pdfIn PDF document text
    • http://topplafond.xyz/boomboxx_i_dey_video6c4hr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_e1356d0ce40f4855b437cfeab9bd7af1.pdf?index=trueIn PDF document text
    • http://bidanata.rf.gd/rexiw.pdfIn PDF document text
    • http://zipavisaxa.epizy.com/how_to_factory_reset_samsung_c460fw_printer.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_48ee085c129643e9816bc7721c6919ac.pdf?index=trueIn PDF document text
    • http://patuwab.epizy.com/porubotavonukotiferadan.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_76638b4f27d241c8bb8fdaacfe5192ff.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_91028d989f4c4ea6bdcce2af3b208b9a.pdf?index=trueIn PDF document text
    • http://fedaposadado.rf.gd/34308132981.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_cba3848b36e9433ea2d3bc0a118ef2fa.pdf?index=trueIn 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_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 5692 bytes
SHA-256: c2628723a1f116f33593239699337b390ffb55f0d5b2c764c0d789ac3f300e9a
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 9864 bytes
SHA-256: 8bdb3d1c4bec16a7e248354726a635bbc9e4300bc34cc093398c8df5679493ae

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