Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a7fa4befe775ce…

MALICIOUS

PDF

74.6 KB Created: 2021-02-27 22:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 260581c215eff6fad0306978185939cc SHA-1: 240170c355e53172c078f7bfa2af13deb16ab1c3 SHA-256: 61a7fa4befe775ce4dfd2410f9dad55af07cd78c97aa516b6fe2bd758987379d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are generated SEO-style links, indicating a link farm or spamming operation. The document body, though heavily obfuscated, suggests a lure related to public health issues in Mexico. The presence of ClamAV and ML heuristic firings strongly suggests malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/strik?utm_term=problemas+de+salud+publica+en+mexico+pdf PDF link annotation
    • https://cdn.sqhk.co/kegufamop/tjigjji/world_war_2_tank_commanders.pdfIn PDF document text
    • https://cdn.sqhk.co/wetewajaba/ORifjfr/2336414594.pdfIn PDF document text
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/2610251.pdfIn PDF document text
    • http://onlineeshop24.xyz/10845025788h7313.pdfIn PDF document text
    • http://freds.space/chippewa_lake_ohio_fishing_reportbwi07.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/pasimifoxidep.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/76fe6f48.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/what_are_inferential_statistics_in_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/7tif2jf/love_quotes_short_for_her.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/tixeligufokup/baby_bjorn_original_carrier_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/is_1917_the_best_war_movie_ever.pdfIn PDF document text
    • http://widusop.atwebpages.com/81682683447.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/free_bootstrap_school_templates_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/vuvilejixab.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/99603059506.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 5508 bytes
SHA-256: 347b279f9554c458a3aba40163f3ab74ef38262b9869f14569193a8574fc9da8
font_01_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 11852 bytes
SHA-256: bf933759736d61c7bdb71d8d094e5f69ce14f56ce23e14cfa45af568bda0908a

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