Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f48e159a04e77e5…

MALICIOUS

PDF

90.2 KB Created: 2021-03-12 12:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d7d5eeb295d4f674ee83f6c568b00596 SHA-1: 837d26173d0e737a6c8536ca79804f56b9ea619f SHA-256: 6f48e159a04e77e5a28506c575c127c176f812d52d3abc005aa286bad52d2cf0
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are linked to a link farm heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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/wix?keyword=california+focus+on+physical+science+textbook+8th+grade+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_601495e434b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_6023cfe38858d.pdfIn PDF document text
    • http://lufusozajufa.22web.org/g-shock_ga-1000-1a_aviation_series.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fff31a17f1a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5feed6e172e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_604348bf47593.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/sezebepit/wisibur.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/taree_leagues_club_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/vefumu.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/xatovedizejegedewix.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/85391957762.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/tizajigofanukeretam.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/41850832057.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_778fb32ff3d749d9b265bc698bfabcb3.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_7cbe644083cc480891b2ef5b19c8944e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/act_reading_practice_test_4_answer_key.pdfIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_31391144814f423eae52c89168050988.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_f79eecbcea0b4bf494c858e0d44e037a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/honkai_impact_3_luna_kindred_guide.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_704d81de103b4c6aaa774ae176203536.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_e11b546a369c417da84b5470694fbf37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/womirofop/falsifying_police_report_ohio.pdfIn PDF document text
    • http://fofodas.rf.gd/91606463727.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 5892 bytes
SHA-256: d5b53adbcf6c40db84e5c9361748295c19bc21b0518a52ecce383bde00abe7ce
font_01_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 11168 bytes
SHA-256: 76b01743f91ddae16e1795352bfe517cc1884ddb580f83d98dc526b05fe06a41

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