Malicious PDF — malware analysis report

Static analysis result for SHA-256 990ba252a1128db5…

MALICIOUS

PDF

76.9 KB Created: 2021-06-08 10:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d7a5d6321fd2c3546aab7d7978d8cc9d SHA-1: d0a693dc1242e8e7809653a7a38e00849114d9ec SHA-256: 990ba252a1128db5cc85e518071fd04509b80117cb1248e07c74843db426e94c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URLs like 'https://allytemp.ru/pbw?utm_term=cartoon+network+summer+resort+game+download' indicate a lure to download content, likely malicious. No scripts were extracted, but the PDF structure and link farm behavior are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://allytemp.ru/pbw?utm_term=cartoon+network+summer+resort+game+download PDF link annotation
    • https://lefiluke.weebly.com/uploads/1/3/4/8/134887161/203895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5feaec609916f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_604cc8d1cec2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_602076a7ead98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5fff1568ae523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fcd6cf773cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_60263249c34bf.pdfIn PDF document text
    • https://lugarulanug.weebly.com/uploads/1/3/5/3/135383187/lusumuloj-voxav.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/2274825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fdd8fa971bec.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/ee06b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463532/normal_6001f53e75712.pdfIn PDF document text
    • https://lowujowe.weebly.com/uploads/1/3/5/3/135320741/4f1d14e62fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_6068427f238e8.pdfIn PDF document text
    • https://kumojazoj.weebly.com/uploads/1/3/1/3/131381946/dediguj.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/4169236.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366022/normal_60aff43494956.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
    • http://tozuxexap.pbworks.com/f/53294789169.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/72168296121.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/argumentative_essay_tips.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 5156 bytes
SHA-256: 0c92ffaa6a76d09ec683ab789817e3ff17af218a0a605ba07d1d62c1822bce51
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 10740 bytes
SHA-256: 1ee355a1cc7a747aaa3a5b43d82eda64c57c2993a124f19ede379efab6b3992e
font_02_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3