Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9c855b07decce1…

MALICIOUS

PDF

76.8 KB Created: 2021-02-05 13:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e128bbfbed759d4a788f475151c5cff8 SHA-1: a6f3216409b73fd7e8437aa5d323c46181804f98 SHA-256: 4c9c855b07decce17ae5c1aa625c9f9e98926dbf9dfc3f6f24454adbae0aed8a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The embedded links likely serve to download and execute a second-stage payload, aligning with T1203 (Exploitation for Client Execution) and potentially T1059.007 (JavaScript) if the redirection involves script execution.

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://yafferge.ru/123?utm_term=smart+toilet+seat In PDF document text
    • https://cdn.sqhk.co/moxinivo/ighbjbf/85383651579.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/KRggRNB/watuvupe.pdfIn PDF document text
    • http://gojepifega.22web.org/gowidop.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/aXrjjwS/6380734759.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/fhgCmhd/classworks_student_login.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/igeJhjN/xamovumizojesewedoj.pdfIn PDF document text
    • http://contact-git.top/lajakvnxcv.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/x7JVTij/hovercraft_getaway_mod_apk_1._1._4.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/YnRiel5/20922013675.pdfIn PDF document text
    • https://cdn.sqhk.co/tumufiwusifo/0dcgDLk/siren_head_meme_sound_button.pdfIn PDF document text
    • http://study-english-05.site/clarke_trumpet_book2klue.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/OjcYagh/49995964643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zigimavabixexib.epizy.com/aids_full_information.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/tenegefiros.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/alcohol_use_and_pregnancy_consensus_clinical_guidelines.pdfIn PDF document text
    • http://pivewumo.epizy.com/good_food_guide_voucher_canberra.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/mobeletesukuweruda.pdfIn PDF document text
    • http://zukavinu.rf.gd/46559550492.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_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 4932 bytes
SHA-256: c0f1126d68cc482664ceae05a947ad0eb42490456b28e1e7add451640500dd14
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 10524 bytes
SHA-256: 395e167e27344ae35496c694fb7c50e5445a8714373d2c9ac80ed2f7127a8959

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