Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c51db83311ecb8a…

MALICIOUS

PDF

72.5 KB Created: 2020-12-19 12:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f6e82d9d0b1c4fd870922dff78021e44 SHA-1: 49357aea8fdb4bc80ed17a9471bb2751e069f1d5 SHA-256: 1c51db83311ecb8a9535d9f882bd30f260fdaa92b2a1a06408337f94460c4347
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffking.ru/strik?utm_term=yo+kai+watch+strategy+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408865/normal_5f926280cf21c.pdfIn PDF document text
    • https://peniwomafases.weebly.com/uploads/1/3/4/7/134705361/7229983.pdfIn PDF document text
    • https://zozovuxogufeduw.weebly.com/uploads/1/3/4/7/134766710/wopofedozopifok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5fb88f22490dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_5f9c3e9579611.pdfIn PDF document text
    • https://seduzitatadobi.weebly.com/uploads/1/3/4/3/134371103/9d93e.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/2861442.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/5659219.pdfIn PDF document text
    • https://xinusikavafomi.weebly.com/uploads/1/3/4/3/134353784/2568880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f8705609d542.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/d159c.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/vokeri/statistical_learning_using_r.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1012fe5c7695ca99c31f6/t/5fc7875fa038a451bcf07eb5/1606911839921/pobawoxix.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/pekubiledo.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/tazopejitigibokel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2afa6394b41d6424bc80/t/5fdd93d142c0045a33e83790/1608356833676/rizaxazawa.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/dwi_el_paso_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 4184 bytes
SHA-256: aff27e9405bdba738400653e33ab3c63235ca723ab39c304d287d4c466a847c8
font_01_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 5388 bytes
SHA-256: 01e9c6073be8120b6cadbf752ee67ef0bba643b6e52c62d2c160246bb396c765
font_02_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10764 bytes
SHA-256: 8c93aae386009f6bb4d7348a3a5e4c08b57a78890cb7a073eb91a3034d9b5d45

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