Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4b7cc683f25cbf…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 20:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aad3881519f2b77be7c46ccf41fa5d0d SHA-1: 7825d85160391024e21eac91a74203dcda98ebe2 SHA-256: 0d4b7cc683f25cbf1dcb01d2520c00b721c718dde23c7fd194232bc5af423976
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://pelibifir.ru/wix?keyword=jrummy+root+apps+apk', which is likely used to redirect users to malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of numerous links suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/wix?keyword=jrummy+root+apps+apk
    • http://winoraama.site/20786309344jumdj.pdf
    • http://trastenmyqort.online/dawovss825.pdf
    • http://merovew.xyz/12151475992gbura.pdf
    • http://lazebusotidedof.22web.org/spencer_centrifugal_blower.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://femodizabofowu.epizy.com/google_sheets_countifs_not_blank.pdf
    • https://uploads.strikinglycdn.com/files/1b3570f5-c9a1-4ddb-95ac-763af462bad5/how_to_use_bitcoin_atm_machine_video.pdf
    • http://tojederetesez.epizy.com/etre_et_avoir_exercices_ce1.pdf
    • https://uploads.strikinglycdn.com/files/f5a31f5b-d65f-43f3-84f8-87c091ae07ff/iris_blue_dubai_reviews.pdf
    • https://uploads.strikinglycdn.com/files/08265e6b-8d01-487d-ae0f-a53118c99805/mobenekabevizisibemoke.pdf
    • https://uploads.strikinglycdn.com/files/cafb7f1b-6eb4-49e5-bbe5-e387eb968bc1/newtons_laws_of_motion_quiz.pdf
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_665549c5cedf47ba83ea7571a97f2088.pdf?index=true
    • http://tikolikenugim.epizy.com/3921758796.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_a070d13e868a458aa6f262bcc6fc1919.pdf?index=true
    • https://uploads.strikinglycdn.com/files/91d14c3c-7a88-4b3f-8db3-85998e3b8940/12155074563.pdf
    • https://uploads.strikinglycdn.com/files/09f60924-9e2f-48ee-821a-5cd6cb414fbc/weber_grill_handle_light_review.pdf
    • http://sinalowus.epizy.com/27583041458.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc20.bin
1cce2f8bb757c96a15e836bf82ce85ef89ddd58123e687b3b0662a9ffc1185d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 5088 bytes
font_01_sfnt_off0000ed63.bin
b7eb1df7033ee293c3b15b41b1d6483b076e7fbfdd4b59b63851463e0e95f985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 12448 bytes
font_02_sfnt_off000114fb.bin
29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16132 bytes

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