Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21dbf2df2866393…

MALICIOUS

PDF

96.6 KB Created: 2021-03-23 12:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e9bb1eb16d90616a6d46d77fe43067a0 SHA-1: 4f80c37c9a36db5a0b68587824d2a20917fec417 SHA-256: f21dbf2df286639327d677150a2d59c22e5932bb99e22df0814bd6b46d03c5ea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://fokemale.ru/award?keyword=bodoland+movement+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414489/normal_602da70e16438.pdfIn PDF document text
    • http://nicepics.xyz/13479164832lxgxk.pdfIn PDF document text
    • http://aazzzry.space/radesqvr5d.pdfIn PDF document text
    • http://palitra-cveta.ru/312311162698otf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_6049c6404b149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491175/normal_5ff7c9c049c6d.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/48159091961.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fe2a48c02d60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5ff1adb277c63.pdfIn PDF document text
    • http://present-mag.ru/barrett_jackson_auction_dates_2019jlgbx.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/xukanomarexumu/18994421356.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/9232213563.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/fender_2020_limited_edition_super_champ_x2_cajun_blonde.pdfIn PDF document text
    • http://jafedave.epizy.com/47643880363.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/rinnai_gas_stove_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/is_gluten_free_bread_okay_for_diabetics.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_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 10352 bytes
SHA-256: 25cbb0b28fff52270fbc25a92790cbb0bf475d16eca20318aff9cab8efce8341
font_01_sfnt_off00013aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 5020 bytes
SHA-256: 060d17efcfbc3927b8ad16f809a8941ae9bf26798afac50272d35b53cbc2ca48
font_02_sfnt_off00014bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 12260 bytes
SHA-256: b0778c0ab3c22fd8eb8df7cfbd5252e5ce9fe628fc232941d2f3e610319d9039

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