Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51afc206a1f855e…

MALICIOUS

PDF

88.9 KB Created: 2021-06-12 05:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bfe2269c148d10fa820a15678b29302 SHA-1: 65c42a3a6bf965895a7bdc4de6bb56f9ff5ac29c SHA-256: c51afc206a1f855e747a1f8d890f935b43765977e074ab9873f56e69c574a39b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to what appears to be a link farm designed to mimic search results. One prominent URL, https://midufefew.ru/123?utm_term=circus+tamil+movie+video+songs, is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/123?utm_term=circus+tamil+movie+video+songs
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fc916af653fb.pdf
    • https://cdn-cms.f-static.net/uploads/4483870/normal_603e3c1dbce6c.pdf
    • https://cdn-cms.f-static.net/uploads/4453721/normal_60bf76515997b.pdf
    • https://cdn-cms.f-static.net/uploads/4465270/normal_6054e57d76aaf.pdf
    • https://tetikofigutuda.weebly.com/uploads/1/3/4/4/134445118/005355e27e2882.pdf
    • https://lasajazog.weebly.com/uploads/1/3/4/8/134885140/salefededej-benikow-wiferofu-golobilininitul.pdf
    • https://cdn-cms.f-static.net/uploads/4449990/normal_601423c335fb1.pdf
    • https://cdn-cms.f-static.net/uploads/4458150/normal_606a202260eb0.pdf
    • https://gifaxefapi.weebly.com/uploads/1/3/4/5/134598377/3116615.pdf
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6041af229d38d.pdf
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fe44e5a8a925.pdf
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/vasegefew-xobese-miwotupovofemew-wamedad.pdf
    • https://cdn-cms.f-static.net/uploads/4482027/normal_5fda967d30976.pdf
    • https://cdn-cms.f-static.net/uploads/4480579/normal_604ae658c3665.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zuwofig.pbworks.com/f/how_to_get_ielts_certificate_without_exam_in_uae.pdf
    • http://viforepolu.pbworks.com/w/file/fetch/144998712/tupufemupabut.pdf
    • http://lovixov.pbworks.com/f/rutil.pdf
    • http://pamotekegopa.pbworks.com/w/file/fetch/144465576/batch_convert_jpg_to_online.pdf
    • http://pilujibos.pbworks.com/f/ethos_pathos_logos_test_answers.pdf
    • http://jifosez.pbworks.com/w/file/fetch/145079568/81055243246.pdf
    • http://pebegijopolo.pbworks.com/f/dizisosux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f08.bin
b98a385449d03e06ca53b85a6fbf3a2e7d1759d0babfd2b796e908ac169fbdea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 5224 bytes
font_01_sfnt_off000120b5.bin
c3da368f74d3cc2e36858bba481782a79246a3f37778b0fe51690b069c6b3d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 11600 bytes
font_02_sfnt_off00014824.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14824 4324 bytes

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