Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0aa022d10c754e…

MALICIOUS

PDF

69.9 KB Created: 2021-01-25 18:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8f43be5ee3b475f8d19809e14626192a SHA-1: 2420fd661781fd38d862b23a56cf0d1bcb2c6ee2 SHA-256: 8e0aa022d10c754e78b356cee32b012d81e863c6dc9350fde2ab22e6907c69a1
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The ML classifier and ClamAV also flagged the file as malicious. The embedded links, such as https://yafferge.ru/aws?utm_term=bleach+brave+souls+for+pc, likely lead to phishing sites or malware downloads, indicating a spearphishing attachment attack vector.

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/aws?utm_term=bleach+brave+souls+for+pc In PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/db0a9a5.pdfIn PDF document text
    • http://winoorama.website/71422693110tgypw.pdfIn PDF document text
    • http://spain50off.info/ferileginoxumoxubob4wtrz.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/toxozazorebovogaz5ehd8.pdfIn PDF document text
    • http://cosmeteca.com/peggle_blast_how_to_get_long_shotsyyrdh.pdfIn PDF document text
    • http://all-host.site/xixoradajokidedesazitwyko.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/5330929.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/7154550.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/1069036.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/wovoxedawutofeb.pdfIn PDF document text
    • http://bavubuseji.epizy.com/dixepi.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/96066061625.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/bnp_paribas_mutual_fund_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/sewezute.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/95708143144.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/65679619992.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 5352 bytes
SHA-256: 25e0732c406d749bb6d26d9c97b57b6a3ddf525b3b87896aef85f513fc6742e6
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10940 bytes
SHA-256: 175f64f26e4b419e3de619f44351192d7e33ca124994429aac04b03479f88acd

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