Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbba291c811a4821…

MALICIOUS

PDF

90.6 KB Created: 2021-01-31 19:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de9fcce7c4b908a055a4e31c28ea47cd SHA-1: 3d71bd8606e955a49eac53fc980b80240f630a1d SHA-256: bbba291c811a4821873396e8e02cfe515a21a8b9d172a5f27d95c2a9ceb3e9f8
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The document body, though heavily obfuscated, appears to be a lure for software downloads, indicated by the presence of terms like 'apk english'. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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
  • 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/aws?utm_term=sword+art+online+black+swordsman+apk+english In PDF document text
    • https://nixunirebexif.weebly.com/uploads/1/3/0/7/130776125/712ca3b96be6.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/vafixo-kunoto-todafuxos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5fe6a49fe50d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_600bbb5eae6f7.pdfIn PDF document text
    • http://pudevivufug.22web.org/33202355828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fc84d73b502f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5feb513c38dc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ff155daf28c4.pdfIn PDF document text
    • http://sodamasagu.66ghz.com/irda_exam_date_sheet.pdfIn PDF document text
    • http://visanekis.iblogger.org/apology_email_template_sample.pdfIn PDF document text
    • http://jefuxifutubanal.iblogger.org/vmware_esxi_6._5_u1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petilawunabebi.epizy.com/bofevef.pdfIn PDF document text
    • http://sozanizitug.epizy.com/menozew.pdfIn PDF document text
    • http://zoxutudirufusoj.epizy.com/personal_training_program_template_excel.pdfIn PDF document text
    • http://futuwerelak.epizy.com/193694780.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
stream_002_off0000cb58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCB58 28280 bytes
SHA-256: 1938f9e81e4fe0ce782ea9784fd923e0f8200a88f2fb62de31875a091c6c8a55
font_01_sfnt_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 5884 bytes
SHA-256: 01b91b7902eabb45ca84e6f4ed5848be6fc802ab20835d7aa4ae5f9f9c7dc902
font_02_sfnt_off000135ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AE 11728 bytes
SHA-256: 70e87130fdf5eeaf87f6a6a8b68ca263afb73f52a5eeb3279601f1aaa3f0cad9

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