Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3453d90fad2841…

MALICIOUS

PDF

72.7 KB Created: 2021-02-27 14:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4fd80195e8e4c0cc91436d9b40590177 SHA-1: 874ec88f44f8f25aad998f7bfdddbaa71edc9b05 SHA-256: cd3453d90fad28415a4614edcaa352e13173b1e25eb96f3b87a065acc1247fdb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to '1984 study guide answers'. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a malicious intent to redirect users to potentially harmful content.

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://pelibifir.ru/award?keyword=1984+study+guide+answers+part+2 PDF link annotation
    • http://dirtygirl.fun/bowflex_pr3000_home_gym_parts40i4h.pdfIn PDF document text
    • https://cdn.sqhk.co/jizesusaxeta/Hjeywih/dr_robert_chesser_rock_island_il.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/jfWhdec/danozov.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/aiKvMll/pitch_perfect_instrument_tuner_free_download.pdfIn PDF document text
    • http://air-calm2.club/zelevugi3aqrz.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/c0ibDha/nogokag.pdfIn PDF document text
    • http://starkrobotics.org/751409092707r2xo.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/hhwgihi/jozoromosobuvulepazew.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/what_does_sexually_frustrated_mean_for_a_guy.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/umrah_guide_booklet.pdfIn PDF document text
    • http://nasevozowu.22web.org/vunav.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/dosuzujukarej.pdfIn PDF document text
    • https://cdn.sqhk.co/kukugejekibi/Ajggege/voriwuwudukej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 5816 bytes
SHA-256: 11f5ef8cca3e7cf8478a90c99d3c2531cb45b2e6f3a5364fcf7d1dcc4ab6ade1
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 10624 bytes
SHA-256: 50a9110448b101daa5393b18be32e2253dcafdd238753c35d09a59ce017dab2b

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