Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a8801e900b59fb…

MALICIOUS

PDF

80.8 KB Created: 2021-01-26 00:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2af1c258256f2a8a447421f3fcb1e52f SHA-1: 9e05e8e39b64d4a55aac7b8a40f92a2759370892 SHA-256: 37a8801e900b59fb69b2087fd8e5154287de8a589c60612e3e10300bb8127e2f
192 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, some of which are flagged as malicious redirectors. The presence of a 'download button' heuristic and the ClamAV detection strongly suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Kodi jarvis 16.1 apk download for android', indicating a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=kodi+jarvis+16.1+apk+download+for+android In PDF document text
    • https://tufakuxumiwe.weebly.com/uploads/1/3/1/4/131454237/zexitelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5fdad4902e1c5.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/aijjghh/talking_chucky_doll_mezco.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/7459797.pdfIn PDF document text
    • http://zumasuxujole.22web.org/3086179840.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/zogif_poxamoxu_tezola.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/4jdbggT/monster_truck_toys_for_2_year_olds.pdfIn PDF document text
    • https://vewutuzukep.weebly.com/uploads/1/3/2/8/132815207/9953598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_600ce6fa6f7a6.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/miziriwaxajuwej-gesale-jozokafotudaval.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fecb0322527e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5fc80ddbc9e2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitoritobo.epizy.com/98370069001.pdfIn PDF document text
    • http://wiwawilif.epizy.com/lewadosazoma.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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 5536 bytes
SHA-256: 6ea4690f990efc7291f0b127ec3e11b3e9f700dde2b1f51e0cd666f9cf2b83bf
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 11996 bytes
SHA-256: 511cf20ca9f0790bf09b832dd6a465a19e77dc92ec8d7ea71f7e6891f8be09cc

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