Malicious PDF — malware analysis report

Static analysis result for SHA-256 af89657136aa1672…

MALICIOUS

PDF

76.8 KB Created: 2021-02-15 09:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9f99108002392a0e600047011818a619 SHA-1: fc70ff14db7eb8421a5c8dbeafa965102313ae8e SHA-256: af89657136aa167213a744ed26e96c19220a1e1fe6098e4322ed04395896201d
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 0.9997

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://bologen.ru/strik?utm_term=baby+sleep+sounds+app PDF link annotation
    • http://tekchambre.xyz/botim_free_for_iphonezqyay.pdfIn PDF document text
    • http://geekcods.com/dependent_clauses_worksheet_with_answerseqtew.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/kefalipevijofu-vafopuju-nujave-sumebexemewuwox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_602166892d41a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387427/normal_6008266af2649.pdfIn PDF document text
    • http://innov-cis.net/lagu_cover_asmara_2lk1aq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_60260294cb371.pdfIn PDF document text
    • https://cdn.sqhk.co/penavagalo/h2xhihj/gazelamiji.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/revoninodexosesatut.pdfIn PDF document text
    • http://qlemelest.online/62947353817ofont.pdfIn PDF document text
    • http://apelsins.space/wepudekonewexagaluxopururadgbt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489058/normal_5fda744e7abc8.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/1399390.pdfIn PDF document text
    • http://wevutibena.22web.org/vukulizita.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/duvuninixi-nalupu.pdfIn PDF document text
    • http://lupaper.22web.org/kiroxadumilafiliwazowizud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavofedelozus.rf.gd/12571737981.pdfIn PDF document text
    • http://visiporogid.epizy.com/tutorial_autocad_architecture_2015.pdfIn PDF document text
    • http://tubaduk.epizy.com/fipuwetaselovopadivura.pdfIn PDF document text
    • http://xexitotikix.rf.gd/gdb_debugging_cheat_sheet.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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 5148 bytes
SHA-256: 11f302da16c7206bb77e772f8df836ebbaed9f3b484d2a54f1ce2dac2352ebb3
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 10856 bytes
SHA-256: b6604173c1b739f1ca832dc4b5f276462554f7aab6770ed48f05f148d8c2bab0

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