Malicious PDF — malware analysis report

Static analysis result for SHA-256 60539af7e7aee2f8…

MALICIOUS

PDF

87.9 KB Created: 2021-04-04 09:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ba597dbb7c2fa679aec235886a2b32e1 SHA-1: 8a3bd00ba5ac39edd4c94b846f03b334afd5a07b SHA-256: 60539af7e7aee2f8f2fe13103eb94d6f83fcfa65bb22cd0fb2c8fc05078bf65d
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 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 0.9990

Heuristics 5

  • 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.
  • 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://vilenefex.ru/123?utm_term=beauty+plus+me+apk+2015 PDF link annotation
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/3896605.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/61144330470.pdfIn PDF document text
    • https://xefujalebide.weebly.com/uploads/1/3/2/6/132681694/kaxiziti_vejedakeworig.pdfIn PDF document text
    • https://kirejoji.weebly.com/uploads/1/3/1/4/131483098/poxotenu.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/73368567358.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/f8477499ff6c170.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/74785106f.pdfIn PDF document text
    • https://bolomekedi.weebly.com/uploads/1/3/4/7/134769876/seginemulejoxaxower.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/nowafala-sudovewutoza-sarijujidiwawo-zajusolokisuxe.pdfIn PDF document text
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/7783de28.pdfIn PDF document text
    • https://savozajit.weebly.com/uploads/1/3/5/3/135320594/2141476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_327ea4531f6b4f0b9ab079f04da40959.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e1d041-5106-47a7-8438-06842abf06e0/wakedokuzevadigomakaneme.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_7269baf3d6894cd2b83d666d7debd712.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_693814e6e9b0494e80cef847bcb188fa.pdf?index=trueIn PDF document text
    • http://rufefasedoxebiw.epizy.com/nutomisegusitimuzet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd860f8-f653-4afa-8868-1accbb4a023a/what_size_speakers_are_in_a_2008_jeep_wrangler.pdfIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_dd2c61613bfa4adc815bb42595ca133d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f07ec92-7b1b-402f-a943-d4ab4940207b/bexawexetafuvoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74265c0c-8a50-4c52-b35a-776496c53926/pemoteliwipeluvikumulekan.pdfIn PDF document text
    • http://filanak.rf.gd/application_letter_format_for_job_apply.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 2900 bytes
SHA-256: 884cbfdeb878ee20e2c146b05a1641383b41b88cd86c369d761b3a8bde37f1a2
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 5152 bytes
SHA-256: e0e9442f9bf949b70916e5b5081fff25b3a7ae709cbdc18e6824bb50ceebda79
font_02_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 10856 bytes
SHA-256: 86eeb7743ee5c1708d46eb5fca73c10523109b4c0d0c19fc590f70a33afd8cd7
font_03_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 16296 bytes
SHA-256: d8bece1f2111456e5881b6c1c5b466846d4826e157286312d36b897fe3dae3a7
font_04_sfnt_off00014367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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