Malicious PDF — malware analysis report

Static analysis result for SHA-256 d879b7ef1ef17057…

MALICIOUS

PDF

87.0 KB Created: 2021-03-24 13:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c1624ab978c43cc7dee444c28435b637 SHA-1: 92fc83f6e88b70b875aa01209f16756c332a8c71 SHA-256: d879b7ef1ef17057cc6e0862f9fdf42be335d34db39081d5cdfc83450d567b00
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a 'human calculator' book, likely to entice users to click on embedded links. The presence of external URIs points towards the download of a second-stage payload.

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 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://maypoin.ru/wix?keyword=how+to+become+a+human+calculator+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5fc9190a52a26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5ff2acc00a305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_6054d3adf3c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_6026882c1bd35.pdfIn PDF document text
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/08d18c09.pdfIn PDF document text
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/mufakimewekonuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gunexukod.epizy.com/alone_dp_image.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/80007541784.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_921bae52843640d8bda4a0934633e585.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e90c883-5d84-48a3-bc9e-8fb44e71b3c3/rafolikobepesimov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1b6418-3b8c-466f-a690-f681948e6172/tajebozegodozoda.pdfIn PDF document text
    • http://kugefosames.rf.gd/12731235519.pdfIn PDF document text
    • http://vejemomase.epizy.com/drawing_anatomy_tutorial.pdfIn PDF document text
    • http://fabonek.rf.gd/2882968679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d720a2-c025-4213-9d95-8a83e27f6d65/punctuation_rules_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f428c96-6143-4bec-ab1b-b73899b78054/voxodulelifire.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/5716712040.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/22111470550.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_d62269f9250944c28674f5819a19c1c0.pdf?index=trueIn 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_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 5476 bytes
SHA-256: 7fd89a6cf97a4950c2c026174ce57e3082fbf27d6a93a9ba8826865304a03955
font_01_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 11944 bytes
SHA-256: 9b64d98a1f307f96761f60f5dc2252260aa80d57ee0862da9cda56e8b3575efc

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