Malicious PDF — malware analysis report

Static analysis result for SHA-256 2275f13f81617576…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 16:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 593bffba22f4279a0f0189ab741f3ba8 SHA-1: e61b7ba27683a6aef69f23fa4ce702d4ecfa0471 SHA-256: 2275f13f816175765c1652dd2e69e27eee8bceba48a71cb66960b935adde434f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection or content delivery.

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://bologen.ru/123?utm_term=famous+guitar+songs+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422918/normal_60381a39b158b.pdfIn PDF document text
    • http://theporte.xyz/basic_technical_mathematics_with_calculussrfgx.pdfIn PDF document text
    • http://usesalon.xyz/xizobemopad76sbj.pdfIn PDF document text
    • https://pakefexudexabe.weebly.com/uploads/1/3/0/9/130969404/6e632d5f8e.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/todajak.pdfIn PDF document text
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/6770af284c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5fd7e9d5298c7.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/botuvibapekol_jexufub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_600294504c131.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/rudakoforiribogosel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fe3421c131f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zudavowopo.epizy.com/nezufulimobajip.pdfIn PDF document text
    • http://golofupatawef.epizy.com/android_9_pie_apk.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/escape_from_alcatraz_movie_in_tamil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 5020 bytes
SHA-256: 9fdf413cbd75ab5c354ffcb968595260deac36c1fbc15a1376aa4abaf9724620
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 11032 bytes
SHA-256: 4e9716b3d75373ece82826d674e48d93ee38ccb6cc5fe4566b2bcc36bd7dd18d
font_02_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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