Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55f5e33ff8f68a5…

MALICIOUS

PDF

80.7 KB Created: 2021-01-25 09:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 82809d6c06d7af0049d7db80e0361edd SHA-1: efa434912febd115b4269789d3662ca68cb737f9 SHA-256: e55f5e33ff8f68a52f32435a43d6cb7ac86d607bca013585492858d61e8f975a
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to educational content. The presence of numerous external links, including a link farm, indicates a strong intent to direct users to potentially malicious or unwanted sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffmen.ru/123?utm_term=sequence+show+offs+daily+higher+order+thinking+math+answers In PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/tekutofekemumop-zomumunupaji.pdfIn PDF document text
    • http://7lessons.site/puma_basketball_shoes_near_mestpoh.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/12940122726bylu0.pdfIn PDF document text
    • https://nebuxulusa.weebly.com/uploads/1/3/5/3/135306634/ruxulokuvaravul.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/xepapomon_legizufu_fukelelesazezek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/best_english_speaking_course_app.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/sapifivipi.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/xufefagumew.pdfIn PDF document text
    • http://nupopejif.epizy.com/missing_decimal_number_line_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/doxowabizoruzakap.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/78412005634.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/12221774477.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/peaky_blinders_season_1_subtitles_yify.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 5924 bytes
SHA-256: bdd644a29fe9de2871d2dfd855398a2a6c44a1839312b762ab40b7f7ac0b26dd
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 10408 bytes
SHA-256: 9ecb021d92f95960819f16614f8d588d49e67ded3916d06cf5166429cf154b82

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