Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a263fce627f3bd…

MALICIOUS

PDF

81.9 KB Created: 2021-02-14 00:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0994fcd92cee88e079c79ad25ffa6ea0 SHA-1: c6f3b3b2a0f3242beef19686c7980daf24d51066 SHA-256: a4a263fce627f3bd00bd6e1b0582829939a46e69139273cfb19e07717f0a9884
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm or phishing attempt. ClamAV also detected it as a phishing trojan. While no scripts were extracted, the presence of numerous external links, including one to a known malicious redirector, indicates a high likelihood of directing users to malicious content.

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 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.
  • 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/wb?keyword=decimalformat%20java%20example%20negative In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fe6198daa18c.pdfIn PDF document text
    • https://xepozumer.weebly.com/uploads/1/3/1/3/131380160/nakagovotejefiwebir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413112/normal_5feaf93dcf456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412164/normal_5ffefba953670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_60132168ac86e.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/wulagisi/32934571870.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/prendas_de_ropa_en_frances.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/93846176001.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/holy_bible_king_james_version.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/moruwenibupogupixised.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/xebujomudewugoxujepade.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/black_desert_online_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/precalculus_textbook_answers_glencoe.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/epic_seven_hero_build_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/blaupunkt_tv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/affirmative_imperative_form.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_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 5360 bytes
SHA-256: e01f1d843cf5d2d307cc35fee1607502f24133cb291c689c43ce1d638095b395
font_01_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 11976 bytes
SHA-256: 9a9c6955686d30b074a02affac551fca5f57c8992c904c37c81c0fc7e12a4d36

Open this report in the interactive analyzer, or submit your own file for analysis.