Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe5dccb9820a2b8…

MALICIOUS

PDF

111.9 KB Created: 2021-01-20 07:13:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 10fa329f70fc9fd7fc5035809cff4c36 SHA-1: b2454746220391ef40b9a11ba768b2d788e0b8ad SHA-256: efe5dccb9820a2b89fc896f6de52d05b1595fc2f7c1bf009469c557d0374dd63
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection campaign, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=los+9+dones+del+espiritu+santo+pdf PDF link annotation
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/vujutejotisukob.pdfIn PDF document text
    • https://jukaninigureze.weebly.com/uploads/1/3/0/7/130738482/2285cc82e2.pdfIn PDF document text
    • https://vozunekoba.weebly.com/uploads/1/3/4/9/134902797/4744890.pdfIn PDF document text
    • https://sorafenime.weebly.com/uploads/1/3/4/3/134320910/2896162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456391/normal_5ff4c1b68ae63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366978/normal_6004f40c80cb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fb30a1f5381d.pdfIn PDF document text
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/redojoten.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/ggei3Vc/wijebal.pdfIn PDF document text
    • https://vejazisiji.weebly.com/uploads/1/3/0/9/130969480/zupetegedafidivoj.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/Ej1ieoW/34609654276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417988/normal_5ff2c205afeef.pdfIn PDF document text
    • https://pilolekolaf.weebly.com/uploads/1/3/4/6/134655903/23149addbf0.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/ege4gju/simazapufixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5fbeff11acf0e.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/dovulavavo/subisonubebisorebowuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/vazisosotokow.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/parallelism_practice_answers.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_off000179b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179B5 5132 bytes
SHA-256: 9f257375840e7b49af74c8dfdcd1951c5806f8456ca186578982cacbd35cfec1
font_01_sfnt_off00018b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B38 11504 bytes
SHA-256: a46f878cd2cde2a86905b0931779939962d289482540a34d3b8700f7afbb59c6

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