Malicious PDF — malware analysis report

Static analysis result for SHA-256 446b59ef49ed9457…

MALICIOUS

PDF

73.9 KB Created: 2021-02-23 02:23:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e88ff53e370ea983be18f40b49145a91 SHA-1: 17dde70f29bf4f7d07810b77d950b58d19158428 SHA-256: 446b59ef49ed945704e64c3b9b8f0342c1676aa710c1ee1800eceafcefe1f7dc
154 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on link farm infrastructure. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead the user to a compromised or malicious site. The document body, though heavily obfuscated, contains text related to product sales, likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://crophysi.ru/123?utm_term=delta+14+bandsaw+for+sale+craigslist In PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/5836527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5feb6fd6b3701.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/9134939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5fff436f4a3e1.pdfIn PDF document text
    • https://nozifudofo.weebly.com/uploads/1/3/2/6/132681081/nijepuze.pdfIn PDF document text
    • http://lozejokewoj.22web.org/hershey_special_dark_chocolate_percent_cocoa.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/4833290.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/pegumerirupexaraf.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/demovukukabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405193/normal_5ffbfa04ddaf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff018434210a.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/jemisajoda/pofolowavaw.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/beach_buggy_racing_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/collage_photo_maker_free.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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 5560 bytes
SHA-256: 46a53dc37e1ef0ae1702c940b5662feddcc8b4b5feb86c4ec628005359fa1fe8
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 11140 bytes
SHA-256: b2717e76becd2ef1ed9a0c7b0b2a82567edf3570de5abba89bbfc7f54e89cc56

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