Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba2b6446375a4cc…

MALICIOUS

PDF

73.4 KB Created: 2021-06-12 06:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8a65be6ac932741b9c6719dcbe3eb339 SHA-1: 038309e684fec434b5a37f0b9fa3dad9c2b56dad SHA-256: bba2b6446375a4cc972182c3c6068b9eee9a071bec379197e760f717e9291679
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'garglob.ru', suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards an attempt to redirect users to malicious content.

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://garglob.ru/pbw?utm_term=the+umbrella+academy+graphic+novel+pdf PDF link annotation
    • https://lovokavupas.weebly.com/uploads/1/3/0/7/130776776/991175fc9ad9.pdfIn PDF document text
    • https://xuwapitevakud.weebly.com/uploads/1/3/2/6/132682402/2510058.pdfIn PDF document text
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/wabemijajozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_602a9c0f24668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_60511c9f548f4.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/1634204.pdfIn PDF document text
    • https://fiwenozagor.weebly.com/uploads/1/3/4/3/134363395/403284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f1db32-4495-4747-b56b-b491809bb1dd/54962703830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58449e89-aa3b-4d30-a712-144f2532653b/vujijasavadizalezusagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885aa4c5-c125-41e5-b9b8-d51f8138b5a6/99478625033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eced5ba-1ffb-401b-92e1-cb8241f1c14b/3408553013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1b3050-b795-488a-a444-ca0881403adf/mazex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36933235-19fe-4394-ab44-e4f325b53350/gaxepetiwevomulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ced8f3-62fd-4c55-96c1-0d9255339b87/linazibif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ca652d-0037-4848-9bfe-a3fd72c4bc0e/what_is_a_primary_care_provider_pcp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf122683-a419-42f4-a104-eeec8514e667/data_communication_and_networking_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837b9ed7-b426-4a25-ac13-613329930d3a/19754833589.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 5640 bytes
SHA-256: bbb301aac203222b210839810197709943a89d2be57a33334744aba787264153
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 10656 bytes
SHA-256: fe4d96d480ff4357afc459d28ac30a594bcdafe9f9d23ab336eadbc455380515