Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a21600762cc301…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 16:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: f3bae9fbe40daed41f28a80d81cc858a SHA-1: 49997c881c464a954f0eb0dd4d7d5566b05be42e SHA-256: 62a21600762cc30189835895c7540b59b9bca7ec535f082630d81ad7a32d693f
184 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including one pointing to a potentially malicious domain, suggests a phishing or malware delivery attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yafferge.ru/strik?utm_term=python+3+dictionary+get+all+values In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_6025a55fd632c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_6009abf37230e.pdfIn PDF document text
    • http://mexodinawikil.iblogger.org/advanced_college_level_vocabulary_words.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_60074f65c1e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_600b50f5ed85c.pdfIn PDF document text
    • http://tisanonorupo.22web.org/panasonic_plasma_tv_65_inch_vt50.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/kifonalisajogazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5fc5fa8ce30e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_601b2fd0352e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_602000c2486dd.pdfIn PDF document text
    • http://ita-talia.fun/list_of_all_regular_verbs_in_englishet3b1.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/msi_970a_g43_plus_manualh90hp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5fe374fe154eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zinizebaki.epizy.com/43065291730.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_bde9bcec595642189b3fade025a5c762.pdf?index=trueIn PDF document text
    • http://retipike.rf.gd/toga_made_from_a_sheet.pdfIn PDF document text
    • http://pugamob.rf.gd/67767049516.pdfIn PDF document text
    • http://segegilomojok.epizy.com/what_am_i_riddles_answers_29.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_a3b84e262f774b3fad5de45ffc1808c7.pdf?index=trueIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_351827339b7e433fa322e95e413f7f94.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_41f34243ea7941868b6d3fb8ef57810d.pdf?index=trueIn PDF document text
    • http://netixino.epizy.com/aprendizajes_clave_2017_primaria_primer_grado.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 5412 bytes
SHA-256: 52855ac2b4f11f5088805e9710e019ebd6b8fa9e0ad03f27c84146ceeecf159f
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 10452 bytes
SHA-256: e66e2c21dd489166702cec35f02a673a26e2a031aab877c1cd67472aa1c431ae
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176