Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcb73dc23dcd252…

MALICIOUS

PDF

71.6 KB Created: 2020-11-20 03:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bae1d791f4b1ab6e970804b2dcd1921d SHA-1: d22bee19abce2f99548ba48ac49e0f92404cf476 SHA-256: 0bcb73dc23dcd252415db12f93b84c61566f4cb945d8875193e6e32dbebb4e5f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a PDF link farm designed to redirect to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

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://traffking.ru/aws?utm_term=classic+wow+orc+shaman+leveling+guide In PDF document text
    • https://tuzuwopibas.weebly.com/uploads/1/3/4/3/134316447/lizutem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f91001a5c135.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/fixaxi.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/6362055.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/gamavowunumilo_pifipetibaw_malilililaje_valavezifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5fb7140da39ef.pdfIn PDF document text
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/bimumesawe-finaniwajezo.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/kosamupim/no_country_for_old_men_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/60575914161.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/baburnama_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/59605002816.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/99423733615.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/76242965726.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/roper_dryer_parts_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/sapiens_download_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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 5412 bytes
SHA-256: 2019a141d5f23f433cc53bed44d2f655922599e944383c9b390b2b9aa00cc12d
font_01_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 10588 bytes
SHA-256: 2ce85446e4c9b629b11b036485caef999ae33fba97f65265dd63549a942486d4

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