Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffb5be1df4d3f84…

MALICIOUS

PDF

82.2 KB Created: 2020-11-28 10:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a2547d71e2b2348e8879cef4c091b17b SHA-1: 19552d25bb27d0a9e8ef669d9b4e2a4e39b7e34c SHA-256: 0ffb5be1df4d3f84d4979e67124f7031403fc1d453c583afaed7802da76e68f0
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The primary heuristic firings indicate that this is a malicious redirector and a link farm, likely intended to lead users to phishing sites or download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/aws?utm_term=flower+blossom+saga+game In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_5fa91fad50a80.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/6624546.pdfIn PDF document text
    • https://gitexerepasali.weebly.com/uploads/1/3/4/5/134577484/7565c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f87316307a90.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/tipirikuduk_dusufitizibobil_xexekod.pdfIn PDF document text
    • https://jelirakiwovul.weebly.com/uploads/1/3/4/8/134867041/8018430.pdfIn PDF document text
    • https://xisovunegukizak.weebly.com/uploads/1/3/4/8/134868464/ccdac3e5fd74c37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87045aa759c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f9685139adc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_5fb37675f40cd.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/jojozaw_pifusamifolat_buwamikegepe_tizidazulogur.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/40b808dd9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5fa731f38e26c.pdfIn PDF document text
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/koberepavun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB96 5192 bytes
SHA-256: 9735f8c4c9ebaa05234d7b6a22b0a5c793e9f4932bc540a923117e90afc9b906
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 17456 bytes
SHA-256: 63f8ca530b24d3830e855f80e8049b014f717692b9d01d9b78ef7cd202573fe7
font_02_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10876 bytes
SHA-256: a4e95edb5ef7839a441a09347e634bb3681d554915ed1803cd04fb97229d874c
font_03_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 16992 bytes
SHA-256: 166122638d6905d7e2381b9e504369f1b36c97737cbf83078e1f24b206436b83

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