Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a7c33acc47c3ab…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 16:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78d3f3ab165cf8c4c47679bb4c54b0a9 SHA-1: 5b107329b54d6cc11b5c32e08ac1186b0b27a84d SHA-256: e7a7c33acc47c3ab888ba73aaacefc47b73592ef9032c793a3a7ad9ef8fbb650
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://midufefew.ru/wix?keyword=photosynthesis+quiz+answers+pdf', suggesting a phishing lure related to educational materials. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URI indicate an attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=photosynthesis+quiz+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4413363/normal_6044970c18dfd.pdf
    • https://cdn-cms.f-static.net/uploads/4470841/normal_602425bcab748.pdf
    • http://afracheat2.xyz/69858181122230x8.pdf
    • http://omynutural.space/factory_incentives_on_new_carsni3ia.pdf
    • https://cdn-cms.f-static.net/uploads/4383295/normal_603052e25ba94.pdf
    • http://golden-bridge.pro/tigojitulepotoo5ik6.pdf
    • http://getcabinets.xyz/48360254139is769.pdf
    • http://domsale.xyz/2003_ford_focusqihii.pdf
    • http://qqkaxes.xyz/three_ways_to_persuade_integrating_the_three_appeals75ac8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://todabopojexojad.epizy.com/how_to_pair_uniden_cordless_phone.pdf
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_bdbe906103d446babd3c84100e25142d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e3c9d4da-c623-49b1-93b1-16adbfc58454/kobizedufiwog.pdf
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_c42fac2c81534ec4a8ba6a9cdcd1d149.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ede53f3b-a91d-49fc-9978-f0d9770ec58d/ready_new_york_ccls_grade_7_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/a4e1c5f9-2bc7-4971-a32f-37fadee74354/90020903162.pdf
    • http://kososun.epizy.com/relotexezosanutel.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_off0000eb99.bin
462856f0a33c8864eb0f90f156f6c22984f1c8a9b8b2af8de235a4f36ff70e74
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 5468 bytes
font_01_sfnt_off0000fe4d.bin
528d10bdf2c51f04a7d86aafa20842481e3314556d901c95b4c2b95f72d6efcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 11440 bytes