Malicious PDF — malware analysis report

Static analysis result for SHA-256 b483405a90f01511…

MALICIOUS

PDF

84.1 KB Created: 2021-02-22 18:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b69f04f308a76e86de33182d582cfe8a SHA-1: dec225779de2a602ca3812b415a6499244aec2b0 SHA-256: b483405a90f01511359690986defd77181f02102769dc7044a94b46302a23d50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://baarspo.ru/strik?utm_term=what%2527s+the+most+valuable+comic+book+ever+sold', is likely part of a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is designed to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/strik?utm_term=what%2527s+the+most+valuable+comic+book+ever+sold PDF link annotation
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/6750090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_60012e880e64d.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/gekujesodajalofol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5fceceddb9f26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5fce6a3c2c1f2.pdfIn PDF document text
    • http://alsamcctv.com/epic_astro_story_layout4ina6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_5fe78dec2118a.pdfIn PDF document text
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/gigeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482012/normal_5ffdb86b61443.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/fotepopunaj/welekuvaridewibowipoti.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/minister_service_alberta.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/levadozusefa.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/can_an_essay_be_6_paragraphs.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/block_ads_and_popups_in_chrome_android.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_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 5492 bytes
SHA-256: 4836f3c8da102d6f9be618df8c67a4afc6e73631a860d783edede2618285a320
font_01_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 10712 bytes
SHA-256: a55c74f12b2aef11e53b4307432cf0fa173df7fdbcb8ade0371f01b73245655e

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