Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68cdd270558c8fd…

MALICIOUS

PDF

68.8 KB Created: 2020-12-30 20:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 914c96b6a532113f202a530092d63c22 SHA-1: c89244326d6f102cfda957fd1d4cf2ceaa01edef SHA-256: d68cdd270558c8fde64f4d9fd3724163e8b4c1d0273277fe9a49c746747999db
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services and one specifically to known malicious redirector infrastructure. This indicates a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=zero+factor+property+in+reverse+calculator In PDF document text
    • https://jedufopev.weebly.com/uploads/1/3/4/4/134490540/nurenexapidowonekowe.pdfIn PDF document text
    • https://wokesije.weebly.com/uploads/1/3/4/5/134597961/mufupibutoxefe.pdfIn PDF document text
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/dopawapaf.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/4239866.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/1069894.pdfIn PDF document text
    • https://kuvegegujumil.weebly.com/uploads/1/3/4/3/134367432/vuwoladudijireduda.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/RJijgcT/fabfitfun_fall_box_choices.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/felasorarabipis/sojomiwotufosopaxadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31b508f-9132-4303-bdb6-0d2b0edcc39b/isyana_tetap_dalam_jiwa_mp3_free_dow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0963484-a048-47d7-a0c7-d37f14693bf2/kenmore_coldspot_model_106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc25e2a-8913-4224-b4c3-d406a8361cb2/lapafoweledamupuwe.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_off0000cf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF80 5128 bytes
SHA-256: 57faf71b5bc7a30378b2954a0939f2283b7d63321b13b003719db402cf7c6f67
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 11008 bytes
SHA-256: 5b2ce65e0a25a836ebf9558c646d47dbcb9a70de328168b111acf6bd7c3d7087

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