Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d389bfb48ecaa81…

MALICIOUS

PDF

73.7 KB Created: 2021-03-23 13:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 25965f15fafefdc4aa67c9694b155bc6 SHA-1: c0f9ffaf3e932f8150265490f4d0f918d02f70da SHA-256: 0d389bfb48ecaa81867051e19ffdc6267b8baff7deea8f9ee3278c765c2ece3a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or hosting malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially used as a lure for spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/award?keyword=tylenol+and+motrin+dosing+chart+together+pdf PDF link annotation
    • http://ledabojuvogo.22web.org/panasonic_combination_microwave_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/idxgeRt/online_spy_camera_app.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/1zaFCPP/winob.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/idxiHid/53361627556.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/Wkhduhb/carson_wentz_stats_2019.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/ecd3317d-8a77-460c-8bd5-ee0a2d4b0565/environmental_impact_assessment_act_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42c0f62-a5ac-4b0d-8ffb-0c6486c2e25b/mi_planta_de_naranja_lima_libro.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_7628e9f7ffad4276ba8e0a98ebd9970a.pdf?index=trueIn PDF document text
    • http://mikesivu.rf.gd/14546394873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43190d9-f021-4fb8-af09-4f054fc01cb5/denokuxiwafobovubuju.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_fe62d3c2357a40e4854b83dd9d2d8f6d.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_b401ed1a41a1494a86314f9585b6c436.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_959055d7b76441f7a8e72a7b4552b101.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6907e8f1-d0c8-4c25-8bc8-5236fdbdb04b/zonarofevirelovoborotega.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_2b361469bb38488a8196091b6f156c9a.pdf?index=trueIn PDF document text
    • http://bixuxopot.epizy.com/68982401355.pdfIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_7874a2c49bdd453ebcc1e075ed9495fa.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_b9df15c4d0eb47baa8c2e43d132c50bf.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_dd6135ee67a04d24a4203d38e44d20c1.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_6e44280092774a749198d96f11b0771c.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_d552dd0e851640c1a2250b8729ff7c8a.pdf?index=trueIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_712d5d37d5334e8b9e340fdb36891d95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/156a95a1-3ac4-4138-8d9b-1c6171230643/dakegipupisijapuj.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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 5620 bytes
SHA-256: ad95651b8774263f9efd81e488050b530ad0c80509902e6d52cf0707ba3e5cdf
font_01_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 12072 bytes
SHA-256: 1257fc6be3e30f1da976f8c86d98b6827b36bda007c578276ff5cc501dba3624

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