Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cff1d0db464a20…

MALICIOUS

PDF

64.1 KB Created: 2021-02-20 00:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df60712842a228accb7c6e7c8f1660b5 SHA-1: 932ba1cfa32a44f6aebf8a295760a68f51e409cf SHA-256: 18cff1d0db464a200f4daee0c22eaede38e3402dbc9df9a3eb82abd5223dc419
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of numerous links on disposable hosting and a malicious redirector points to a phishing or content-luring attack pattern.

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
  • 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://crophysi.ru/123?utm_term=charting+and+technical+analysis+fred+mcallen In PDF document text
    • http://granitmetrospecstroy.ru/guidestone_financial_resources_dallas_texasfou0t.pdfIn PDF document text
    • http://dayzcommunity.info/como_resolver_limites_trigonometricosbvlwh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470524/normal_5ffce24b1b0dd.pdfIn PDF document text
    • http://deflecfcvy.best/phonics_worksheets_for_3rd_gradersxc01e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5fc85084101fb.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/jgigejj/83647435815.pdfIn PDF document text
    • http://teachersaid.fun/ami-aptio_dt_2006_ethernet_driver8hnap.pdfIn PDF document text
    • http://edapog.online/matlab_legend_komutusk5db.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/hcutia9/kagoporexejufipo.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/guIsdKH/light_em_up_song_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6023730a906c0.pdfIn PDF document text
    • http://naykaryadom.fun/hello_kitty_emoticonsqqcfu.pdfIn PDF document text
    • http://ecoterritory.store/evan_moor_daily_reading_comprehension_4th_grade0b7uq.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/3hfPYID/66951906464.pdfIn PDF document text
    • http://scoretdho.best/pictureka_card_game_rules2yhw0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5fd1c8e4863ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumerapugegivo.epizy.com/camera_raw_lightroom_update.pdfIn PDF document text
    • http://funurebebepoti.epizy.com/summer_acrostic_poem_template.pdfIn PDF document text
    • http://mubomapobe.epizy.com/axes_io_mod_apk_terbaru.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_off0000bec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC4 5444 bytes
SHA-256: 40fd58b42b3e0e684601fa56ea543f133e0cb60136c8832967b336ed07dd95ed
font_01_sfnt_off0000d121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD121 9812 bytes
SHA-256: 05d50593e4ef723956b3dd1badf30d1bf8f3771b19b69a17d84dfbc182e3fad4

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