Malicious PDF — malware analysis report

Static analysis result for SHA-256 aceb23acea86f8f0…

MALICIOUS

PDF

67.9 KB Created: 2021-03-12 19:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 019230e7705bf661e23d95a1931c9d61 SHA-1: 891cc3127e49e91a6169738eb73e31f11ddd80ba SHA-256: aceb23acea86f8f094fb57fc8172f988619eabc3db6eb116856fdcb580e3243a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to a link farm designed to distribute other PDFs. One prominent URL, 'https://golowaki.ru/award?keyword=geosphere+and+biosphere+pdf', suggests a lure related to search results or awards. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=geosphere+and+biosphere+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366011/normal_60053e2c9f7c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fdfad74c4729.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/what_is_the_most_common_and_crippling_phobia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_60452c3c78dd2.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/bleach_manga_volume_1_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_604873c157eb3.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/benedetto_xvi_libri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_602a16711b920.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/firigugixujotov/pudume.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/6th_form_interview_questions.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_3a1f8d0d3bd14ac284b285d5daf26752.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_1ca379c0d0f840e6b7c6b81f735f0385.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_c48c2fa57eab424fa776c2ac50693cd0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/single_digit_multiplication_worksheets_printable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/79538644668.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_e666b1bf979944ff9a8b069244c5dfe7.pdf?index=trueIn PDF document text
    • http://petojijoxura.onlinewebshop.net/26090556280.pdfIn PDF document text
    • http://xumerapugegivo.epizy.com/wacom_bamboo_ctl-_470_software.pdfIn PDF document text
    • http://fosixokosed.rf.gd/98812472508.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/focusrite_saffire_pro_40_macos_big_sur_review.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/how_do_i_reset_my_furnace_thermostat.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_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 5268 bytes
SHA-256: cfe4a6a3bb8f5815703ada9443255b2a571c528e06c8741b393db3d58acb2e7c
font_01_sfnt_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 10172 bytes
SHA-256: ebb91da16071caea79f1a36e956d70bec812005637dbc02492d74ffe4f2a06da

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