Malicious PDF — malware analysis report

Static analysis result for SHA-256 915461ef7ecb4e52…

MALICIOUS

PDF

69.0 KB Created: 2021-02-19 04:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 96c5415a514dc1222048f3f1a9844b0b SHA-1: a43698e84f74ec5123304e53f15ae2e47d9cc9d4 SHA-256: 915461ef7ecb4e525dad6b58fb752e0dcb7c1b9cc0b9a5c58205194e77d92256
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary attack pattern appears to be a phishing lure designed to redirect users to external, potentially harmful websites.

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://yafferge.ru/123?utm_term=coach+quilted+belt+bag In PDF document text
    • https://cdn.sqhk.co/bozadukopufu/OjfFjbX/74108434615.pdfIn PDF document text
    • http://philonio.online/53423818624bq6zg.pdfIn PDF document text
    • http://naturka.space/a_tik_tok_videotq838.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/5tifjhz/xivuxazoxanunixevesabisi.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/clmZajd/foosball_table_parts_names.pdfIn PDF document text
    • http://handler-autoscout24.com/eadms_answer_key_biology6unjc.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/8hgifgf/how_to_hack_among_us.pdfIn PDF document text
    • https://kenofina.weebly.com/uploads/1/3/5/2/135295682/rewam.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/fhik3jc/26161632266.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/iaNjjia/airtel_dth_recharge_code.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
    • https://s3.amazonaws.com/xenavuxa/cellink_neo_app_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/notazaduruwixokuxabomazix.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/52056653660.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/128_bpm_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/acolyte_training_manual_lutheran.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_off0000c0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CA 4992 bytes
SHA-256: b8150a0b3327f8e8c1553be974cd121d9a620008d2ae5be80cf1d27507a375a8
font_01_sfnt_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 11328 bytes
SHA-256: 8867fb2c9a38ad20cb9f69cbe838e725646113379c0efaf58db12a0a6b0233c7
font_02_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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