Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff6b49dba971a31…

MALICIOUS

PDF

134.7 KB Created: 2021-04-03 16:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20dd2c69715a5f25ba99f9907dba5777 SHA-1: 43fd4ac225b94e9815f83531beca92cea0e4fc58 SHA-256: 9ff6b49dba971a311db7fa7e095e4c984a635f4c23233178e22843b22c268388
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 are generated and point to various PDF files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external URI firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/award?keyword=asian+financial+crisis+pdf PDF link annotation
    • https://cdn.sqhk.co/mujejadalale/gjghQcq/tanokozokuzuduvidawemepu.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/ralomux.pdfIn PDF document text
    • http://wuwudikosegukem.mypressonline.com/schwinn_recumbent_bike_270_reviews.pdfIn PDF document text
    • http://gililofus.medianewsonline.com/nenekofevavekoluzeme.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/pgjLji0/paruzamevaximurufi.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/benishangul_gumuz_regional_state_constitution.pdfIn PDF document text
    • http://delabozaxexiris.getenjoyment.net/39316199405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/mukut/free_letter_tracing_worksheets_for_pre-_k.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/22397484498.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/busuu_spanish_apk.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_df00b21f867d4d0da30013c400f4bace.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/nijagaxaxememu.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/tozakosugupusuwoj.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/currys_beats_by_dre_discount_code.pdfIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_3d14e1a97a0340c6a7eb3e01fd931654.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_45961b4703464b9fbcfba4f10943f9bd.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_1073ac731df542bda5eff4587cca92a9.pdf?index=trueIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_27edab8874d74c7785dd3942ea32c8ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/rozodimotidoniwozuzogajiw.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/zebekosarakotudega.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001be26.bin
c22386eb076e485c185e3e72279e2155168d5a78d2fd0aa8ed1b18e31d0098de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE26 5140 bytes
font_01_sfnt_off0001cfab.bin
e83801e64237dc4b8e8cba2d324386ed596488f29ffd60e4b66c0dd233590932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFAB 7252 bytes
font_02_sfnt_off0001e389.bin
11b9856e8a00d8de85ea0074452d61143fff5434c52428b7c044f4ec1532869d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E389 12436 bytes

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