Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd1c1cf718aa42b…

MALICIOUS

PDF

75.0 KB Created: 2021-02-22 16:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 52b6266693ecb97d05dc7bcbae895bc0 SHA-1: fc6ee61a2131c862c1dc80ea85a9df9a12a2c183 SHA-256: dcd1c1cf718aa42ba3cb9a87ff5f1742936fb587dabc5eddd8551a70866fa086
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://yafferge.ru/123?utm_term=ron+carlson+writes+a+story In PDF document text
    • https://cdn.sqhk.co/moturira/jf7idgR/68653074132.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/0ghpiec/toy_blast_game_review.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/7ibjdid/wildlife_rescue_los_angeles_ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_6019f48fa2233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384832/normal_5fe453f874071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5fe402951200f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5fdde886bbe8d.pdfIn PDF document text
    • http://power-guard.shop/15642816414cuzt3.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/Bgdhija/clash_of_clans_download_apk_pc.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/craftsman_25cc_gas_blower_215_mph_470_cfm_carburetor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowavef.epizy.com/getajasafo.pdfIn PDF document text
    • http://fiwimawa.rf.gd/golden_state_warriors_injury_report_update.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/react_native_css_cheat_sheet.pdfIn PDF document text
    • http://kapodos.rf.gd/chinese_link_beginning_chinese_simplified_character_version_level_1_part_1_2nd_edition.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/31433810993.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/42781454043.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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 4992 bytes
SHA-256: 7448110c05c10d0bf23e8661cc0d94fd143137f67e9101fc62a5d3a36cb1e5fc
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10256 bytes
SHA-256: c02b2a61ec48a8f17aaa653d3e23001e9ab484a32b491e92b72750f2c6a7e375

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