Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fda48418066766d…

MALICIOUS

PDF

78.9 KB Created: 2021-02-02 16:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a6f9580cb2c593e82b82965b32ad4fd SHA-1: 725d94ae22fc30c7544106fe51cbd7bb505078ae SHA-256: 3fda48418066766d062d2f221860d38e04d13fae507a10ab106f6a673b28668f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution scheme. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

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/aws?utm_term=note+9+android+10+att In PDF document text
    • https://jowozulabu.weebly.com/uploads/1/3/4/0/134013075/3620907.pdfIn PDF document text
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/batavaxedu.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/15afe70c81.pdfIn PDF document text
    • http://pelistens.xyz/jejisuxiterlhb4f.pdfIn PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/4801263.pdfIn PDF document text
    • http://micrometerdigital.xyz/smash_gamecube_controller_layoutpfoe8.pdfIn PDF document text
    • http://cupe1.ru/bekejejewukudegizcoi.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/simitovo.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/fEhifTZ/punakisadugitipofen.pdfIn PDF document text
    • http://iglivesupportteam.com/sage_the_gemini_and_jordin_sparks_marriedseyaj.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/4851707.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/hajhwif/bni_business_builders_nj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/56895967797.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/gawelosep.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/laludatinomanowokibajela.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_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 4928 bytes
SHA-256: ceccba040637f7f9585fc9ae9de772cf5da94e13556c3e37bc83667920e09e66
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 11396 bytes
SHA-256: 1b3cd6a0af1f05e5a01f0f8b821c27542c6b5f929e7359f4963bfe94d0a0cede

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