Malicious PDF — malware analysis report

Static analysis result for SHA-256 682cd4fce5328156…

MALICIOUS

PDF

80.3 KB Created: 2021-02-26 15:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b812deafac1d19e275d87c5e20c1e410 SHA-1: 4759b9bba7804e485af51bf5a6d0a337562a01aa SHA-256: 682cd4fce53281561aa3365ce65064357d6d9c8c7d6bbf5e75bbeed3af509daa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'how to work a tefal pressure cooker' which is likely a pretext to direct users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

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/strik?utm_term=how+to+work+a+tefal+pressure+cooker PDF link annotation
    • https://cdn.sqhk.co/kajutizikodu/OKngcpX/88048943636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_6026d5a64fd59.pdfIn PDF document text
    • http://bumalutaf.iblogger.org/56762433790.pdfIn PDF document text
    • http://teplotronic.ru/326312299162jicg.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/excel_match_data_from_another_sheet.pdfIn PDF document text
    • http://rizaloripejo.iblogger.org/xiniwamuvegibu.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/c9jhw6U/skyforce_unite_apk_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411921/normal_6000746354707.pdfIn PDF document text
    • http://big-ita.space/ff14_feast_of_faminex8ohd.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/Njhibhc/42487517857.pdfIn PDF document text
    • https://cdn.sqhk.co/mezigiduze/jaigzhi/free_ringtones_for_android_phone_call_music.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/ihihiY5/shogun_restaurant_san_diego.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/iaQidjB/rapunzel_movie_songs_download.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://jijazofar.rf.gd/32607756912.pdfIn PDF document text
    • http://fakadigat.epizy.com/les_accents_en_arabe.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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 4856 bytes
SHA-256: 9ae7c26e2fd64866cb73a80ee027e29df7a33c96dffd5aa651053be17331d0e2
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 10792 bytes
SHA-256: 0815bf8b86c963efe79037f55e63b1028da29c7dcf5dd02e8ac4f9cd053d89ee
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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