Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a0be8ccacd8375…

MALICIOUS

PDF

101.2 KB Created: 2020-12-17 00:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c8b30d1d6f754602a671027ae03d04 SHA-1: 1b073340afaa02f4ee43ab78178fdde0d789dca3 SHA-256: 87a0be8ccacd8375194f394be523cd29f72a966138bf18348a2cc0fe64a7f785
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=lowe%2527s+toolbox+for+education+grant+2020
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/jalufa_noperuvarune_jabimurarof.pdf
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/finuvavubabu_jiwigo_buwun_watik.pdf
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/mesawexowoguk_moluviwozata_jideni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0d650403f5353fd956949/t/5fc1333b4e98326c023bb08e/1606497084317/nipevewejejopigoxup.pdf
    • https://static1.squarespace.com/static/5fbffc42bda9c57a97b92422/t/5fc20743cb3e0f577196f03d/1606551364693/82796960457.pdf
    • https://uploads.strikinglycdn.com/files/b221a9ee-50c9-4794-b34a-182e5c0add1a/weight_watchers_points_list_free_download.pdf
    • https://static1.squarespace.com/static/5fc726358651a0475196622d/t/5fcc5fe3cded405bb8cf4488/1607229411649/fonavikuwonukurav.pdf
    • https://uploads.strikinglycdn.com/files/c23a5e72-98fe-4cf5-a1a2-a36c3e9e693f/dosolas.pdf
    • https://uploads.strikinglycdn.com/files/146eb104-f07b-4bbb-a12f-9cd3ac446175/jibujolonirusu.pdf
    • https://static1.squarespace.com/static/5fc5914a5e8e827d42ad9051/t/5fcf1a573fa051062b405f30/1607408221805/tipepovusudugasenuf.pdf
    • https://uploads.strikinglycdn.com/files/3a075503-5969-4972-aa24-8fd0c6cc4eef/.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016a9d.bin
a558facb704f04535b60129956fd65e43941789b11718c28ca9f7beae4fb3409		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16A9D 17992 bytes
font_00_sfnt_off00012e1a.bin
d798b16f6ef00e70082fc6ec218cb97b7aa903cfb185380c11bf266e5d72d140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 5740 bytes
font_01_sfnt_off000141d3.bin
bd5af5687f00c6cb837e37441105f6c2f06bf729162cd5a36e04dd7b9284e7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141D3 12056 bytes

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