Malicious PDF — malware analysis report

Static analysis result for SHA-256 47456ca3139fb63d…

MALICIOUS

PDF

70.7 KB Created: 2021-02-22 21:38:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 551f8d123ec88a3c9d5acf642393175b SHA-1: 76ce219680a042c49606089564e9705c3a970241 SHA-256: 47456ca3139fb63d018114fe34794a97e8e20df5a4baf6c403c4f47619f0217b
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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=food+fantasy+mod+apk In PDF document text
    • https://vafabifagid.weebly.com/uploads/1/3/4/5/134583570/6c652d61f3.pdfIn PDF document text
    • https://deminoki.weebly.com/uploads/1/3/5/3/135310913/nuzetowodusog.pdfIn PDF document text
    • http://7lessons.website/95728048009ol2fa.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/ib9hjeS/voice_recorder_app_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/9hjhggg/zulomerelu.pdfIn PDF document text
    • https://zinibikilejob.weebly.com/uploads/1/3/4/8/134886520/3432672.pdfIn PDF document text
    • https://cdn.sqhk.co/mafozerekat/ijaijjd/gun_club_armory_1._2._7_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_602ab5839be9d.pdfIn PDF document text
    • http://netzamka.ru/ladadazixorintus7m.pdfIn PDF document text
    • http://extrameets.fun/how_to_do_surya_namaskar_step_by_step_in_tamil7dssm.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://pitefabe.epizy.com/math_minutes_7th_grade_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 4804 bytes
SHA-256: 117d5d46428052f255eb228ebfb676af30221b8559d0515526d31b401e4a06ac
font_01_sfnt_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 10704 bytes
SHA-256: 101cee81b6cbf57306c241812680d480e7835fbd7c58565bf9969c2b54baa738
font_02_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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