Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a3046af4b596a4…

MALICIOUS

PDF

120.6 KB Created: 2021-02-17 06:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4470d0a572b05e6487530a67b462baea SHA-1: 0fd1dc1ee3eab338112b27f99b8cf3e198c1f73b SHA-256: c0a3046af4b596a4f5f6b4ec1e5d286e5d6dfe840157e09495aa2a4f7cb23481
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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 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.
  • 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://yafferge.ru/wix?keyword=basic+chemistry+crossword+puzzle+answers In PDF document text
    • http://opssmall.space/nuxiwenijadasepewimobum8btb6.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/dDSijgf/26721068896.pdfIn PDF document text
    • http://cmb-eco.com/kingston_8gb_controlador_ningn_sss6tv462.pdfIn PDF document text
    • http://xaxikobovivo.22web.org/arunachalam_tamil_movie_in_tamilyogi.pdfIn PDF document text
    • http://nibelv.xyz/abrsm_grade_5_theory_past_papersbfcqk.pdfIn PDF document text
    • http://virnet77.ru/sononedigarawofizeruzoafxqa.pdfIn PDF document text
    • http://update-win20.online/binkw32._dll_free_for_windows_xpcilwn.pdfIn PDF document text
    • http://pshcomonhere.xyz/95106034893jgwna.pdfIn PDF document text
    • http://vnds-super.space/desulekuzemenosapg77.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/8620597.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/sitok/barefoot_on_the_grass_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/96437595501.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/28715498308.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/java_windows_7_ultimate_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/morrisons_dishwasher_tablets_safety_data_sheet.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00019e1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19E1C 22516 bytes
SHA-256: a41b0327100f1999eb14a40a2bc9266cdc158984bc922f0e2a9225410d8b4b99
font_00_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 8000 bytes
SHA-256: d627b0bff7cb78e79a1cbd4855296a630b341f0ea597245a338d0a93cc6f1568
font_01_sfnt_off00012f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 5608 bytes
SHA-256: 704fd632cecbb8a0603bffc0e7726ba1dd05abf3f38182b64e6ae610c137a7f9
font_02_sfnt_off0001424a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424A 10816 bytes
SHA-256: 493786e6fa49ea616b7682ffe8364a65051f1cbfcd77d276781434466c8b0ece
font_03_sfnt_off000160a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A0 20476 bytes
SHA-256: 1ad6611f1c7991f7d3bd421855c48b22d6a9cdbdeeb9e97367799ceec6317d8b
font_05_sfnt_off0001c305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C305 4448 bytes
SHA-256: 171c906f57d60e7a48e214adc4367cac7b951db8dd9802afca2e162ceb64db1d

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