Malicious PDF — malware analysis report

Static analysis result for SHA-256 b419ff2b98b41b79…

MALICIOUS

PDF

75.0 KB Created: 2021-05-27 14:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 51904dca9ec9134f040e0cbc57e22d8e SHA-1: 5e54166d36f4d2e5a63bd5c243a2589078eee8c3 SHA-256: b419ff2b98b41b79ad2b097a16a03c69378fd06998698fae71b1071f551d26f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mezovuduw.ru/strik?utm_term=how+can+i+download+my+property+tax+receipt+online+mumbai PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403822/normal_60282c880dd1d.pdfIn PDF document text
    • https://luxelekite.weebly.com/uploads/1/3/4/6/134656707/9685558.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/5ef6fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_6069eeb9bd0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fda03be8343c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_6030a12b582a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_604e1265a6d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_603f1427be510.pdfIn PDF document text
    • https://xamirudanigux.weebly.com/uploads/1/3/0/9/130969419/77ca555cc.pdfIn PDF document text
    • https://beredixe.weebly.com/uploads/1/3/4/7/134762790/zuvox.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/zonisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_602c3f76c93cf.pdfIn PDF document text
    • https://gibodogud.weebly.com/uploads/1/3/5/9/135994226/1138601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_604a95d26ddb8.pdfIn PDF document text
    • https://gorenusedom.weebly.com/uploads/1/3/5/3/135326887/3591153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_60696227ef646.pdfIn PDF document text
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/8431959.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462982/normal_5fc6fb044dbf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_60510d5d906a9.pdfIn PDF document text
    • https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/nuvafopunuba-vepozo-tibosol-woguvu.pdfIn PDF document text
    • https://silukijexopul.weebly.com/uploads/1/3/4/8/134868047/1e14be75186d642.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 5404 bytes
SHA-256: fd92a6ffc63e78bd46040bafff2dff7714e6bf55d425bcf7fbf55d3491eb8dd9
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 10424 bytes
SHA-256: 688402b4cfad1b003901c1580dd196addd231e4c7f839bb82fe83d421e873d2d