Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4873c1ab1c52c88…

MALICIOUS

PDF

72.9 KB Created: 2021-02-20 05:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 78b39327737493cd13596e3ad8822402 SHA-1: 54072099ee038123d32573b072562f615207ad5c SHA-256: e4873c1ab1c52c8858c4d58d28d1d780691b3ac855fa7053cf6d0ca0fe2c9ea9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://leonvi.ru/wix?keyword=eso+clothier+power+leveling+guide PDF link annotation
    • http://pasoxegidameso.iblogger.org/figupewujoweruvufabufeg.pdfIn PDF document text
    • http://wixiziz.iblogger.org/fabofa.pdfIn PDF document text
    • http://viwaginuf.iblogger.org/good_food_guide_2020_app.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/35430690327.pdfIn PDF document text
    • http://conicppjry.bid/charcoal_suit_formal_wedding6fno4.pdfIn PDF document text
    • http://maporirunigis.22web.org/image_comics_page_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5fcf510a2ff3b.pdfIn PDF document text
    • http://aycotoro0.xyz/38811909871delpf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_5fdbdd206fa48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_600a6b3624602.pdfIn PDF document text
    • http://miworusak.iblogger.org/afk_arena_mod_apk_unlimited_diamonds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepijemimubu.rf.gd/michigan_fall_foliage_report_2018.pdfIn PDF document text
    • http://xuwanuxetoto.rf.gd/gangster_games_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/34183839180.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/81345670748.pdfIn PDF document text
    • http://relotetuje.rf.gd/what_happens_if_you_lose_a_lawsuit_and_cant_pay_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/slope_intercept_form_problems_and_solutions.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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 5236 bytes
SHA-256: d144e4bf650a92eecb121eafaa04f23da1d27242faf2a9807313e02f010ef1ac
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 10308 bytes
SHA-256: b3dd2533033fbbea9182d577c5c8285df8d8b46be5e326cb738da1ce3b998e8d

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