Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23dfbad70b0ea6d…

MALICIOUS

PDF

64.2 KB Created: 2020-12-23 09:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2f460219b3408e12d7d2ca4f26305706 SHA-1: 801905260bb1f8fed81371e6051a7257c7ec7623 SHA-256: a23dfbad70b0ea6d1d8f2b13b3643ce83875a95673cee88329b7a0df31667301
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed to link to a large number of external PDFs, likely to manipulate search engine results or distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=download+apk+beat+evo+yg In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_5fa38b4362e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f89796c9dc9b.pdfIn PDF document text
    • https://sawilemevopano.weebly.com/uploads/1/3/4/5/134577559/nezurirufipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_5fd3cf96e313f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_5fc1c3274531a.pdfIn PDF document text
    • https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/dineji_kefolepinepoza_filejutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_5fdad51e8b413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_5fb4b70887bf1.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/wujapu/69059148783.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffb1ae9fc3622d51d09b9/t/5fd07d57a91a8d24337c3947/1607499095921/vent_guide_among_us.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/approximation_ibps_po.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/73192362849.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/speaker_volume_app_for_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ac0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAC0D 4516 bytes
SHA-256: 443c600a3419e108c20c4a371fa5a1474d7888b9aa29805e12d003937351f07a
font_01_sfnt_off0000bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 5312 bytes
SHA-256: 5c9b7461650fce5e570471ae86796431ef9265d9936c1714f045fa1b0736bc23
font_02_sfnt_off0000ce11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE11 12260 bytes
SHA-256: b6f803d285316612346ddd442e65ebccad45cb0e2943701c8e7130667975a366

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