Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b35c1f47350829f…

MALICIOUS

PDF

77.2 KB Created: 2021-01-21 15:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: efd27d9a768ed57f229dd3f8ce0a46a7 SHA-1: 693635764e7989e369a150824c17564ba1e66583 SHA-256: 1b35c1f47350829fcee7467fb9e4cd9470c4060812f9ef98b2939922c0b271ca
156 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, a technique often used for SEO spam or to redirect users to phishing sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to lead the user to malicious content, likely through a spearphishing attachment vector.

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
  • 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.
  • 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://traffine.ru/123?utm_term=undefined+reference+to+vtable+for+constructor+and+destructor PDF link annotation
    • https://cdn.sqhk.co/jabosuve/bjjhdgf/promised_land_chocolate_milk_review.pdfIn PDF document text
    • https://kenigoxiwe.weebly.com/uploads/1/3/0/9/130970014/zugoxiwerabefojaru.pdfIn PDF document text
    • https://kijemaroxajum.weebly.com/uploads/1/3/5/3/135397629/c95689bd7eb6612.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/wuvukokebi_makobikuwagitut_kikovazolo_kegoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5fefa63058c31.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/bromine_atom_formal_charge.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/576151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5fa345101517d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f9bab25c5f2d.pdfIn PDF document text
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/6023405.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/5636764.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/ximupuv/lutepaxizutu.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/83816338684.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/house_rental_agreement_format_chennai.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/aquaculture_of_tilapia.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 5204 bytes
SHA-256: a3d3322162c663ea3daf4c658447bbfabdd96aa53a539d602f539c6a515243c1
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 11700 bytes
SHA-256: 5501537fce663e6a097d5f0f22240bd81ed0d6ddaa540f6475a389ccdbc012c9

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