Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fbcbdf3da5e915…

MALICIOUS

PDF

79.4 KB Created: 2021-04-26 11:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 666101cfa5ddb67e50e465c04d1674e4 SHA-1: 7ec44fef00fd123337955449a5549c19ff20f32f SHA-256: 42fbcbdf3da5e9150a0fbd2e7fa9d8d5120c4c4c1c8989a474c22f5a107817bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one suspicious URL (https://jumiwimov.ru/strik?utm_term=the+unwanteds+book+5+read+online) that is likely used for phishing or to serve a second-stage payload. The document body appears to be obfuscated or corrupted, but the presence of the suspicious URL and the heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=the+unwanteds+book+5+read+online PDF link annotation
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/287cc7715ae61b9.pdfIn PDF document text
    • https://gesajapuso.weebly.com/uploads/1/3/4/8/134873290/panovukokozus_ratapesori_virogite.pdfIn PDF document text
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/lafolibisav.pdfIn PDF document text
    • https://mefanajumajadip.weebly.com/uploads/1/3/1/6/131637152/dipabemele.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/7873526.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/wikurixobelu/15610342494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd0681d-cb04-49de-972e-55149dfe736e/56001279317.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/core_java_basic_concepts.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_7addfa106040496d91268d8dcad336f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce79d10-15d0-417a-8d0c-cded970e11cb/how_much_does_it_cost_to_renew_ma_drivers_license_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/what_is_sigmund_freud_best_known_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb641d9-f294-4a6d-83a7-a9538da6eb68/36678082754.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_3115bb383d1141eaba893dc513fa07e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/10496215505.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_4fa28db7c93846fa84fd58ca00bb371c.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_e187c4fb1d814b8abe62b084aa0ca9e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/suxuguzaxisekiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ec75b6-b112-4f13-b0ed-323f947de3f2/pioneer_mosfet_50wx4_wiring_harness_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/67366185700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468ae01e-24d8-41d9-891f-518f60710929/tirujuvedizo.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_143ff04d5f124d418bc96002a11ef078.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_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 5284 bytes
SHA-256: de1fa2ce66040e4d604e925656396128c990d9f97f3187bff576f8dd90a91827
font_01_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 10540 bytes
SHA-256: d445b2fd2eda18e5a7f4678f95f98217e5cbad059dad34af57d08ef9d0d1fa5b

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