Malicious PDF — malware analysis report

Static analysis result for SHA-256 7887e3963d63d724…

MALICIOUS

PDF

89.8 KB Created: 2021-04-01 20:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 046f9ddc3e81874357595806c30001b2 SHA-1: f2a6b1d4d4b50810935b0d4a1c7d0a12c86d9654 SHA-256: 7887e3963d63d724da63572bf2ccd659cf72f913a868540872a8fe4ad2f523bd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URL suggests an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=autodesk+sketchbook+user+guide+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a66ebd-d146-4ea1-a0c2-a2f91cafa3cd/jilimosisosobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36dfa53-2efb-44d0-9dcb-4a4eba006393/lujisokofo.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_8b6655607eaf45d187abac47c752181c.pdf?index=trueIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_a49d0f7350a54fe69e2f3cdb85d6cd1a.pdf?index=trueIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_00d8755298cb4916bdcea96b276d3f8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac4f3ad-5788-45dc-b829-8defd79a8ee6/normal_snacks_that_are_gluten_free.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_9fc249f9424c4548b636822fadc69e10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a061830-3112-488b-b8b1-88cba7f35b5b/kitikazebafipurutakat.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_f282543aa88b4f5e93fdc49fe881867e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dadupawo/belajar_bahasa_jepang_bicara_membaca_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28b4847-eee6-47b2-ad34-3d6a52185841/vekuvubopelerozuzuriperig.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_80f6788e7cb54c9f840497537e4ba7e0.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_7205b9be776c4081985a661df8bf0b01.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_7c55ea2cf5ba4bbca3488dcb60fdfa8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/texas_food_handlers_test_study_guide.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_fa452a9746884fc3925fc5780ca70f6b.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_4ab0808e680348688a73e308af13b2b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/coming_soon_page_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/916a6e93-93a5-47bb-8be5-119a5cbf4edc/oreck_xl_hand_vacuum_manual.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_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 5368 bytes
SHA-256: aff183a5e426d1ff7fd74a019b423078a7c5e1ebe9e703a8923aca14ebcdc24d
font_01_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 23512 bytes
SHA-256: 1a6ccfd3b6c142c2efc936c4e50be84b94af73755174076aafee0545935ca20e