Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c45824b5574c0a…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 17:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 63d8fc82bbd86c87db1c02a8da87991d SHA-1: cd9aa04a1c24112f42f295ee177be2d187a4c270 SHA-256: 19c45824b5574c0a94c245a00fadcfc1b2ce5ef4b27e12b78ee8c2cc51ea1f35
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including critical alerts for malicious redirector links and ML classification. It contains a large number of embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+does+dystopian+novel+mean In PDF document text
    • https://kovexinuzik.weebly.com/uploads/1/3/0/8/130815277/juvaxisoluwanupezaz.pdfIn PDF document text
    • https://xesusesubo.weebly.com/uploads/1/3/4/3/134348975/mapibokog.pdfIn PDF document text
    • http://wuzagabi.22web.org/introduction_to_computer_security_matt_bishop_free.pdfIn PDF document text
    • https://gizajowi.weebly.com/uploads/1/3/4/3/134314542/vesiwototudovut.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/60a331bbe7.pdfIn PDF document text
    • http://juwatorota.22web.org/five_night_at_freddy_online_subtitrat_in_romana.pdfIn PDF document text
    • http://urro-hu.com/embedded_c_programming25ofh.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/fxhgfyd/388950229.pdfIn PDF document text
    • http://nudistoff.club/35144605145xyu33.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/dededezam.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/ij5WS32/sifobaladipajobuvaniberuw.pdfIn PDF document text
    • https://firulasimasib.weebly.com/uploads/1/3/0/9/130969438/roritawa.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/sidirip_defikewulezi_tiligidume.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/fd043384-c831-4ef8-8955-0efe0bd1d07c/92306790835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560d5679-1ab4-4c0f-b208-c9b0b64bc504/125cc_pit_bike_engine_horsepower.pdfIn PDF document text
    • http://lorazak.epizy.com/vajoxoluvesixa.pdfIn PDF document text
    • http://bovifuxabobi.epizy.com/19297988262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c984ff-3ada-4934-8617-930e5d4283c9/how_preschoolers_develop_and_learn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad84abf-6722-4c9b-b46c-1bb7ab1a98ab/69042734542.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/email_formale_inglese_professore.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_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 5276 bytes
SHA-256: c532f554856d2fa074a35d56d95aab017932198e7471bffd981422d22091ec88
font_01_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 10584 bytes
SHA-256: 330e7040bef8f61788063a37c7850d245b23a6672f46c1035154b3451ea17d25

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