Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8fc355fdaa0c1d…

MALICIOUS

PDF

75.9 KB Created: 2021-02-18 16:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c7c6f174ecd8e55376bfb387faaf0bd1 SHA-1: f55566c6ad9cba7b3d3569cc10b239568c9d57b8 SHA-256: 1b8fc355fdaa0c1d6e2e3baea122015cee2df80776b67383f5f93ed8802e2549
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, suggests a lure related to crocheting, which is likely a pretext to encourage clicking the malicious link. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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 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://crophysi.ru/strik?utm_term=how+to+crochet+a+blanket+with+two+colors+for+beginners In PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_6010b50064750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fd730f228b20.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/2395974.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/6767749678824mh7.pdfIn PDF document text
    • http://reduslim-europa.site/acpi_ifx0102_1_hp_driver_downloaddr99w.pdfIn PDF document text
    • http://blancer.xyz/84195692726kgp9e.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/82026012383fiqxm.pdfIn PDF document text
    • http://lidzadva.xyz/king_kong_mod_minecraft_1._12._2tjfej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405185/normal_5fe5ea763010a.pdfIn PDF document text
    • http://smeshnoykir.space/1705055465l7zy0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_601261e3bdd75.pdfIn PDF document text
    • http://daddytestit.xyz/53872496436usfwt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fef187f3af0e.pdfIn PDF document text
    • http://legalvictory.group/80265300797iqkdv.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/qja1eif/final_fantasy_game_series_order.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 5400 bytes
SHA-256: 59cefdcd207620c5b84e2f187f7ecf5c700d96b90e4f5225bf6af9845dd8d6c3
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 10272 bytes
SHA-256: dfec3ee3e6cc196a111a0c8cc14dc6bcb30f157ca7da6e23a15c92cca0f54b89

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