Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb580fcc4dd56fb…

MALICIOUS

PDF

44.6 KB Created: 2020-11-07 22:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 56c51dc6914de448bfc9efaeeaaac6a4 SHA-1: 157fe7a3f422afa4f0d88fb0b6530295196fe0ea SHA-256: 1cb580fcc4dd56fb9217f11b82b31e72aceec771c7f361e8a3200184add0749b
66 Risk Score

Malware Insights

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

The PDF contains an embedded URL, https://traffnew.ru/aws?keyword=2019+eic+worksheet+b+line+4a, which is flagged as malicious. The document body also contains this URL, suggesting a lure to a potentially malicious site. The ML classifier strongly indicates maliciousness, and the presence of multiple external links points towards a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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=2019+eic+worksheet+b+line+4a PDF link annotation
    • https://xasuvakem.weebly.com/uploads/1/3/4/4/134400919/vesafojovagolizigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f874eeab7b24.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/8b7ed9afed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5fa4d3eb4a084.pdfIn PDF document text
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/tobofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5f9b0cdfd9857.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/henghuili-files2/morning_prayer_before_work.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/62199322532.pdfIn PDF document text
    • https://saridejawe.files.wordpress.com/2020/11/63474122853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b823008d-481a-4b21-9c46-d33ee964fbf4/29381493640.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/jackass_streaming_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/the_extraordinary_adventures_of_alfred_kropp.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_off0000651a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651A 5656 bytes
SHA-256: 8fed2bad6276d8d4a52924799ebc1e676044ff0341b1b7164350140182661615
font_01_sfnt_off0000786b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x786B 2168 bytes
SHA-256: 5847cc5d0e38d7d3bce039802537367054f4c703f33f311dd2e8297b69233f74
font_02_sfnt_off000081c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C8 10440 bytes
SHA-256: 406e675d1b4a088b0bd606790c50b65ba2eebbb22aa8157a26c1a7575f562484

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