Malicious PDF — malware analysis report

Static analysis result for SHA-256 2653b6d0b665f3c1…

MALICIOUS

PDF

76.2 KB Created: 2021-01-11 10:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fd472a3a35c66c0061a4660c2f59144f SHA-1: 9fd7c9c6fa24a09dadd405c97c9a3c2688e9e4cc SHA-256: 2653b6d0b665f3c110b8a7eacea6b44dbf7695f78cb24344cd77032ce456b0aa
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The presence of numerous external links, including one pointing to a known malicious redirector, strongly suggests an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/aws?utm_term=bangla+academy+english+to+bangla+dictionary+apk In PDF document text
    • https://cdn.sqhk.co/gawukale/fjjUAhc/16111923428.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/4314570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f890e819b18b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f939923c6140.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/jgqIueg/warhammer_quest_2_end_times_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f87a1b9ef46a.pdfIn PDF document text
    • https://lekusilikeveb.weebly.com/uploads/1/3/0/7/130739001/4667261.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/g1ghiJj/teenage_girl_halloween_costumes_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_5fe9046ed7285.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/hqajbhj/62117484094.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/senodiw/94231442823.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/excel_text_format_day_of_week.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/cuneiform_phonetic_pronunciation.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/gatasugakutedi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59E 5840 bytes
SHA-256: 33193690e21f51e371f8585976a9d3e6c5a9173d71efa14ff18b15e97e28b34a
font_01_sfnt_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 4812 bytes
SHA-256: 8edab8837910e28ce6ac22ad79c4b22901b9b94f02b9064460276ec4ac130d51
font_02_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 10660 bytes
SHA-256: 0a78c49536ac8a24e2a6da7a2201242dc84edcf4096d699bd2d682b481f247ed
font_03_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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