Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef0d4c3826a157a…

MALICIOUS

PDF

93.6 KB Created: 2021-03-19 14:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7526aa30de67459b03d4007154f55660 SHA-1: df13522406a27eef8b0279d8d0a55a46f4230c6b SHA-256: bef0d4c3826a157ab1fb54578b227e6a9996e4959148e1b5ae414d8f85ec54ae
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external links, including a link farm designed for SEO, pointing to suspicious domains like 'nipisod.ru' and 'sabovibin.medianewsonline.com'. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/wix?keyword=prophase+plant+cell PDF link annotation
    • http://sabovibin.medianewsonline.com/why_did_my_logitech_mouse_stop_working.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/5106970621.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/inside_bureaucracy.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/76025885020.pdfIn PDF document text
    • http://latutuvifem.22web.org/76848626518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_c13edf3b1c9e4382b0b19e9dde9f4704.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tazopaju/how_to_create_my_own_screensaver.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_65b630b227c6446086c6b31746b7937e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/faa_flight_plan_template.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_906229cc65704ebb9b21142018553fe9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokamoba/pvc_crossbow_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/iopex_technologies_interview_questions_and_answers.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/facebook_icon_not_showing_android.pdfIn PDF document text
    • http://todivakumaju.rf.gd/93231882612.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 5020 bytes
SHA-256: 93cdf844cc6891ebe223f1222df87429bc2c8dd6d7c8816f6609d53331a0ac18
font_01_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 11664 bytes
SHA-256: c52908a7d1fc0d142b7739cf29ae2cc00c81a1c7b9151fefef28d60dfd3ba31a
font_02_sfnt_off00015434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 16204 bytes
SHA-256: 5851d9f4b962b76fb7cd4b299f96aed3c7409f2515713d38e88c1ab5b242b749

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