Malicious PDF — malware analysis report

Static analysis result for SHA-256 6231149864b281cc…

MALICIOUS

PDF

111.2 KB Created: 2020-11-18 13:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5925bb8e40585eace87c332ccb020ef0 SHA-1: 11b83d875bcde2d1dbd3318dec07d1700f04e430 SHA-256: 6231149864b281ccc420e0bef8d300382575c8b586cfc0bbac1697ffd358017f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirector. The embedded URLs, such as https://traffking.ru/aws?utm_term=metodologia+de+auditoria+de+sistemas+de+informa%25C3%25A7%25C3%25A3o, suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely related to T1566.001 (Spearphishing Attachment) and potentially T1059.007 (JavaScript) if active content is present.

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://traffking.ru/aws?utm_term=metodologia+de+auditoria+de+sistemas+de+informa%25C3%25A7%25C3%25A3o PDF link annotation
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/9693585.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/5132851.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/xujiniri.pdfIn PDF document text
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/sifowizabezuxidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f87f7c18d5a4.pdfIn PDF document text
    • https://tovorugezix.weebly.com/uploads/1/3/4/5/134599805/besif-kuvotalevezi.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/zotego.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/bokexizometun/piriformis_syndrome_strengthening_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/bozefutewe.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/benward_music_in_theory_and_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6a20ae-1f19-4edb-9751-0a00949a263b/maburobesilub.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_off000170aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AA 5732 bytes
SHA-256: 6e3ac140887ba794d0549e640e24757965f30ae7dd1f384588528bdba2628280
font_01_sfnt_off00018387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18387 13888 bytes
SHA-256: 6de5f2ecf3c9ddae38d079d4d88a16c4ac344d3b718df69c4724274886e09095

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