Malicious PDF — malware analysis report

Static analysis result for SHA-256 7443d9ce7460f177…

MALICIOUS

PDF

121.3 KB Created: 2021-05-25 03:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bd9a5e48e7feb43c619f73a6de7c2299 SHA-1: 90259da83c58ffd3655294b013ce521104b185dd SHA-256: 7443d9ce7460f177df6a9019e589f0782da8c338860c48e72bb6e171ee19efef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is 'https://leonvi.ru/strik?utm_term=us+army+field+manuals+for+sale', which is likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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.
  • 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://leonvi.ru/strik?utm_term=us+army+field+manuals+for+sale PDF link annotation
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/jubowugozulo.pdfIn PDF document text
    • https://lakiregatu.weebly.com/uploads/1/3/4/5/134589313/firud-zigifulor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_602650ee0dc21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_6021833f29ab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414695/normal_5fe39527338ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378425/normal_5fe425d73bf55.pdfIn PDF document text
    • https://sozazoje.weebly.com/uploads/1/3/1/1/131164180/6244976.pdfIn PDF document text
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/5795973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_60265ef279875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_6068d039d877b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_605d8bf646c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_5fe7ca671df50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_604468f341fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_6015bbc8f291c.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/wujodibu/wodemudezujotimugela.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/9126992154.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/hp_6700_premium_ink_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/watupigekipomoxixi.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/total_coliforms_in_drinking_water_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/the_firm_nas_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/what_element_is_not_found_in_all_living_things.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/vupizabajeganatowofi.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/zemadol.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_off0001a056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A056 5148 bytes
SHA-256: f827c21caa46e0ba7689d3f6f1622b7dcdb2b4a58c6e089a29862060ee314914
font_01_sfnt_off0001b1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1C8 11036 bytes
SHA-256: defdc73cece74db04a98918dce444c9e0bd5386eec326d5e8bf668e6288a743a

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