Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66878de7cc59f78…

MALICIOUS

PDF

81.0 KB Created: 2021-03-13 12:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 82e732547a401eccf08c828ce6532853 SHA-1: a7e51ee1d1db4f5768b142a37b8cec063981c5aa SHA-256: d66878de7cc59f78274e9ae08f2e9c5af00390eed80719d76950939fd00e3ab1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one specifically identified as a known malicious redirector. The heuristic firings indicate the document is designed to redirect users to malicious infrastructure, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://yafferge.ru/wix?keyword=trouble+in+terrorist+town+rules In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5fed16eedf5c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5fed35e25886b.pdfIn PDF document text
    • http://nutristrike-shop.ru/36668003769co6kf.pdfIn PDF document text
    • https://cdn.sqhk.co/kigifadarija/jggcidw/cup_cakes_cartoon_images.pdfIn PDF document text
    • http://instapriz365.site/the_chicken_shack_menu_luther_oks882l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_600b16663eeb8.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/6921064.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/rubibo.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/gjgjgiN/marshawn_lynch_stats_college.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5fed79b604192.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/wetevali/vuzowevemakipobunogos.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_7fbcd94ae35e420196bbeb76672729d3.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_66dd36e89b6f4bb8b37954c2e4bcf871.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/tivejiwezapurinus.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_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 4648 bytes
SHA-256: 093f3db3e733cda8e0b865ec6a6ca93b9e02e7be23f334a730a91eebe166028b
font_01_sfnt_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 10408 bytes
SHA-256: 76d99d556fef21494e9e7a805e76bc05a57a41af5dcea75848a96fc2ded445b2

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