Malicious PDF — malware analysis report

Static analysis result for SHA-256 504d67c4cdac966c…

MALICIOUS

PDF

71.8 KB Created: 2020-12-08 14:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5e9efaa39e13e47b48149eae3f2006d6 SHA-1: 10c016e6b3ffb10d4e4ee10caf8c5690b2a9ab95 SHA-256: 504d67c4cdac966c117df95d399aec6563a34e7584ba8711353b33445919ef2e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?utm_term=plants+are+organisms+made+of+many In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f88b4cb7e165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5fa98df7d87a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_5f8b6d3717fbb.pdfIn PDF document text
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/611001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_5fa8c557ea1cd.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/dodobujilujulo.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/dowesitobuga/35258939930.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/dapirelod.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/lipilikepep.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/how_to_make_red_detox_tea_at_home.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27abee9fc3622d52c1c80/t/5fc4606a173fb5383b2f6173/1606705259197/bathroom_space_saver_walmart.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd04dac7afe470b5575abc/1606223070170/66041829500.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/word_that_start_with_pp.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/mifir.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_off0000cde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 5116 bytes
SHA-256: bd18869514f81a67724fc9bb4a15734be9ec8bc307098cd09eb4a8082344fcbb
font_01_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10728 bytes
SHA-256: 56aa71eb58ee4a097bafaab630681f9dcaff2dc61061db3d0eea6580ad432243
font_02_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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