Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f976421dc0742f…

MALICIOUS

PDF

76.4 KB Created: 2021-04-05 23:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9883937c9bbdd16fc7adb4e57ec7f0ef SHA-1: 995a56dbfdf9641dcf725aeff4794da7aec15e4c SHA-256: a8f976421dc0742ffc3a24aefc3053e99c8511c18488b4d9c5716cc0211dd0db
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 0.9993

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://leonvi.ru/123?utm_term=water+hammer+arrestor+installation+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369507/normal_60223d74ebce2.pdfIn PDF document text
    • http://tuguxanofa.iblogger.org/board_game_template_esl.pdfIn PDF document text
    • http://kungfumalibu.com/dorebasbcm8.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/ludubudajaxawikaduge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_5fe8f6531b4e2.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_5fd64d18d1ea3.pdfIn PDF document text
    • https://lukijijuvuz.weebly.com/uploads/1/3/4/7/134742917/7781732.pdfIn PDF document text
    • http://martans.space/plant_paradox_diet_recipesli4ui.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/fgeEhdr/tibobozovevam.pdfIn PDF document text
    • http://wopazav.22web.org/pimubupeligonexam.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/luxiwewijaze.pdfIn PDF document text
    • http://fixetufuzafix.22web.org/80304894452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fc8daa25608a.pdfIn PDF document text
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/livilaxetu.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/gizjdhc/super_pads_become_a_dj.pdfIn PDF document text
    • https://pudesopajaxeb.weebly.com/uploads/1/3/5/3/135346715/jexif.pdfIn PDF document text
    • https://konupalak.weebly.com/uploads/1/3/5/3/135315701/jalugiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/mP3dbTD/farsi_language_keyboard_free.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/qerphba/bopakar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_60362df7f0d90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fudowoxalukiki.rf.gd/rufidogege.pdfIn PDF document text
    • http://wotonopeg.epizy.com/23482115610.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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 5252 bytes
SHA-256: c3868323cfcaae2bc944c5c7e8b69f25f852425261c6b79149f0157792caffe5
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10500 bytes
SHA-256: 737cfdc81716360ee6647173708c882305a81ef273091ba69cca597a703ae732

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