Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc312912f06bc27…

MALICIOUS

PDF

82.0 KB Created: 2021-02-11 15:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8672c0e7522585e50e208ec27be30d15 SHA-1: 1e5b672bc751d8d924e04e7a52c0407f7fab22da SHA-256: 3fc312912f06bc2700148df84fa76538d22e6097e0c883d93cbf4666428fd5c1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=my+boy+gba+emulator+pro+1.6.2+apk In PDF document text
    • https://cdn.sqhk.co/sisuriwul/jjbeXjh/zugetemigobave.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/cidhaii/jajirurisililigawegageguv.pdfIn PDF document text
    • http://zomebosanetoviz.22web.org/kuzojinalus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489980/normal_5fd38fc185d11.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ighhviI/51293582287.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/hidjapY/vote_for_president_2020_poll.pdfIn PDF document text
    • http://naturagrush.space/82293517292is80r.pdfIn PDF document text
    • http://romabuxaxaxo.iblogger.org/44511506482.pdfIn PDF document text
    • https://cdn.sqhk.co/gotulurowav/gh7ibPT/zedadosulakivexemuwufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5fd087a2c5132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6021f1d7e80f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mimiwuzoxul.epizy.com/assassin_s_creed_origins_prima_guide.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/free_guitar_chord_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/21497189118.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001046c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1046C 22944 bytes
SHA-256: a4af3ff98068a65ebf6dc9a710c797d90ab19b8e2c1bac12490c436137a6b841
font_00_sfnt_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 5372 bytes
SHA-256: a063c16ea0a9e3f3fa14b33b345a84eca5ad9c0bec233bbf4afe43b7feb2e5ab
font_01_sfnt_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 10212 bytes
SHA-256: b64a5d4aeacb2ae5010ab2caf9e0e0a022e9829a19a1fa0572aa503e2bd6b152
font_03_sfnt_off00012ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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