Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f37733fe43eb72…

MALICIOUS

PDF

73.0 KB Created: 2021-04-02 17:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d28df318c86abc3848f28f61ac4e2f7 SHA-1: 289d8b8045cebb5122fdead4e966032c7f0b4ab3 SHA-256: f0f37733fe43eb72ec1ace0c322e2ba4148f3042804291f712267aaf0e49d0f7
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a URL that appears to be a search result for a technical document. This suggests a phishing or social engineering attack, likely intended to trick the user into visiting the malicious URL. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=centrifugal+compressor+design+and+performance+david+japikse+pdf
    • https://cdn.sqhk.co/mupalewefe/Chhijhh/52185239335.pdf
    • https://static.s123-cdn-static.com/uploads/4416787/normal_5ff343e035cf2.pdf
    • http://gunekagafa.22web.org/sivowajuwudiruduzoxebuma.pdf
    • https://cdn-cms.f-static.net/uploads/4458407/normal_6045d5c96ea12.pdf
    • http://dopelozaf.22web.org/breast_cancer_ppt_template_free.pdf
    • http://mefizilexofe.66ghz.com/civilization_6_gathering_storm_epic_games_key.pdf
    • https://cdn-cms.f-static.net/uploads/4388613/normal_6040fd601ecc2.pdf
    • https://cdn.sqhk.co/gejupajo/hfzgx54/men_s_nike_windrunner_jacket_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_9f9e439ad33e44d3a1fdc42b9528d42a.pdf?index=true
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_ef9dbef873844d79acf1e674c67c13ae.pdf?index=true
    • http://xabasib.rf.gd/contingency_plan_template_sample.pdf
    • http://gerutijotinana.rf.gd/jolunevalovelivotok.pdf
    • https://uploads.strikinglycdn.com/files/28f59fce-596d-4ab1-94ef-631d07209cd1/10154846190.pdf
    • https://uploads.strikinglycdn.com/files/ed3621c9-58ff-429a-a60c-e0e40861555d/hindi_english_alphabet.pdf
    • https://8459f3b7-b2e6-4b58-af31-5f29adf293b7.filesusr.com/ugd/a68450_5487bdc8f8274b1aab6caa9d33081a67.pdf?index=true
    • http://welididoseburiv.epizy.com/gelemegerevarimanajonogil.pdf
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_ccc427f5ee824292bfa8536d1fd47b0b.pdf?index=true
    • http://diwiludoki.rf.gd/google_chrome_full_setup_offline.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedf.bin
2712dab8a6f2a8e97b0c815b2cc5be97b0cba7a78f0397010ceeb6f694018042
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 5580 bytes
font_01_sfnt_off0000f1d5.bin
a6b76114de0671cfff96cfd9bdb5120d286f174011dea7ca311774f3bb8ba559
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 10636 bytes