Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ce60f44950bded…

MALICIOUS

PDF

78.9 KB Created: 2021-03-06 07:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5311372adecb83fb47b922ae06f1f1c3 SHA-1: 98eb5690ffb332b98407fc4f4b5469ec7626d67b SHA-256: 26ce60f44950bdedfaacad83d98310beb6fb10f203420a8c2f0c17f51f350740
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=is+maggiano%2527s+open+on+new+year%2527s+day PDF link annotation
    • http://effektzhizni.ru/75053174206k2wqy.pdfIn PDF document text
    • http://autokenn.com/attack_on_titan_season_3_part_2_dvd_release_date_uk7151x.pdfIn PDF document text
    • http://rubyshup.space/zoverasajovorelig7gtz3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5fefd0a434b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_601b830a73ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_60327d278b067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_60336eeb9193d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_17d7d2886e704fd1996f427a7515c8f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e62838-3973-4933-9ad6-93f56696f15a/faxesejelukonomelugawes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad509b7-cdf8-4299-85d8-a96afe8a3438/selenium_webdriver_example_in_java.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_59193bdb3f974eefad01b3f2cd63b029.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetevali/c_form_application_due_date_in_maharashtra.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_cf6371495fc14196858f6f48d1de1369.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84524b3f-c5a1-4ed6-89b4-ce1f3b6fcb09/how_to_lose.weight_walking.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_57a09e155c6b4b13812182d9706bd5a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daselex/jidujamijefur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4085358d-3bfd-49b5-a7f5-ca42b7c0aa03/nkjv_leather_bible_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33089c64-790a-4bd9-9e39-c7d0364ffee5/norelco_5000_multigroom_review.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_5ba956ed0d9f4b609b58ddcdc6b43cb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabf0625-9750-4654-8514-6a94a53eb7cc/53040985770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d2bd84-a0ef-4484-88da-3a935d093074/28368723872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d853fb9-fcd2-49d3-9c96-c56ee4afc69e/73069769087.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_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 5412 bytes
SHA-256: c1bfd20f1c37349ca6d3693e14d9f46c2bab58f98595d297321a3690c8a65907
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10888 bytes
SHA-256: 54547d42d32a2cedffcbde30f91a8ff1d9b527b07348494e6ff18c8e25acce0d