Malicious PDF — malware analysis report

Static analysis result for SHA-256 040895a2b5331d55…

MALICIOUS

PDF

65.3 KB Created: 2020-11-07 21:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ef34760c9e4232cfb67ef0dbbfac1297 SHA-1: d2fadd92ab787666dfa02316238786f34a04eef1 SHA-256: 040895a2b5331d5576464fb7f03ebd6325bb0b7f4fa0bd3399a40211140d420f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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/aws?keyword=maplestory+bonus+potential+guide PDF link annotation
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/4377800.pdfIn PDF document text
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/4637828.pdfIn PDF document text
    • https://fixoxotogixas.weebly.com/uploads/1/3/4/3/134374926/tomuxiwazoseruzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f90cf0101ddd.pdfIn PDF document text
    • https://dojumavuj.weebly.com/uploads/1/3/3/9/133997280/nelorisazomiwokijuv.pdfIn PDF document text
    • https://duwobimisenuzo.weebly.com/uploads/1/3/4/6/134615726/3919220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_5f9875dfeb20f.pdfIn PDF document text
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/1529337.pdfIn PDF document text
    • https://dujenavu.weebly.com/uploads/1/3/4/3/134366251/sotejelofajovi.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
    • https://uploads.strikinglycdn.com/files/8c07a2cd-6f9d-4f4b-aa6f-8629caeaf6a4/tutubukex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b32a6a-53da-4ace-8209-96236cc222b2/471857551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fbe022-24ca-4f40-802d-e20fb89946fc/xonumiwumuduboripafatuji.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ba53.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBA53 27612 bytes
SHA-256: 6ec4733f3fbe4a152d09f5e6e62d3430bf8de92441701d7d3ed800cdf238d64a
font_00_sfnt_off000083b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B5 5256 bytes
SHA-256: b99b59f8a6acdd5452c92a2cff4a56088c7ca5da05dfe7a2ebb9da65b72b0ad7
font_01_sfnt_off000095a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A0 10648 bytes
SHA-256: 1ee31e45330062979c456a276a3926742c91bea45e1d2cafe50646e3e58291c2
font_03_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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