Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3ce0be9cfdb7e5…

MALICIOUS

PDF

80.8 KB Created: 2021-03-13 16:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b7d5c84ce67a08246090ec3f77b1d130 SHA-1: 578e3727aac5e17ce99bc1245f693e460e812d4e SHA-256: ea3ce0be9cfdb7e54a3e6d27f9cc400720fffae32695c4cce95ee365dc2a7a05
184 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It contains a high density of embedded URLs, many pointing to disposable hosting and redirector infrastructure, suggesting a phishing or scam campaign. The presence of 'utm_term=jeans+size+guide+eu' in one URL indicates a potential lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=jeans+size+guide+eu In PDF document text
    • https://cdn.sqhk.co/kisunika/Omk7Bie/ripuzipuvapopipevogebi.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/71229519381peqxm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464082/normal_5fdd6c4d6411b.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/jdVILgd/88166495824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_5fd9658c50ca6.pdfIn PDF document text
    • http://moneymaya.site/mecanica_de_suelos_y_cimentaciones_crespo_villalazhse64.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/hhiaAye/xenajesadazi.pdfIn PDF document text
    • https://cdn.sqhk.co/kapudome/hiEiggi/70181053167.pdfIn PDF document text
    • http://xtrading.buzz/dfi_50_calculs_en_5_minutes_cm2jbl3o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6031bc2eaf338.pdfIn PDF document text
    • https://cdn.sqhk.co/tezikegoj/Hjdhdja/jajofubajiketalamabelej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fccd2531e0fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53913cc8-aa06-4589-87f5-5ba5ccfb4d8e/72795394579.pdfIn PDF document text
    • http://kubatejabudebuj.rf.gd/addis_ababa_city_road_map.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/turoth_slayer_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/32634289438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240fbdf6-35c5-4ff6-92eb-83978e806513/what_is_a_fire_and_ice_condom.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/57540380227.pdfIn PDF document text
    • http://tuxizosog.rf.gd/25874398421.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/airtel_tv_app_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/egyptian_gods_and_goddesses_worksheets.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_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 4904 bytes
SHA-256: 323f50e688508d3d05e110178db2c08ae4a5bca374d74effa83f8ccfae92a1fe
font_01_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 11672 bytes
SHA-256: 2d2466dcf77ebdb26bd8d2341e2d19d15a08d350ebfae7745a5d8379032fe015

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