Malicious PDF — malware analysis report

Static analysis result for SHA-256 562845f1c1afa9ab…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 02:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ba764f8046dfb657705bae666517cff8 SHA-1: a9f26b7b0129fb361bb532b0d235f8d6c929935d SHA-256: 562845f1c1afa9abb4875976f46f6a40dddd736bf3841911c3cf4f0d3bb1d11f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URL points to a domain that appears to be part of a link farm designed to redirect users, likely to a phishing site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attempt, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=petsafe+in+ground+fence+extra+collar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461511/normal_601df3b93350b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_601042a394495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5fdacacf36ef9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393193/normal_5fde11efa90a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fd3888d83b81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ff3be7f9b8bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fcb98ba4cb16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_6040edb2bac37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_4ee4ab9d30874309823f7295a2eff642.pdf?index=trueIn PDF document text
    • https://51364a6b-283d-4537-b9df-48522fd8faf2.filesusr.com/ugd/921180_d8a684c0e2c847c789e59a130c5d8759.pdf?index=trueIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_9a1da58f438346988b71cbde1000319f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96070a7a-79ad-43ac-82ef-ded9e3aee9d4/81715277514.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_16745ea048ec4d108010af2d12f045b0.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_c9630552b02f47af95b2f4d3d8d8ceda.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_000aa4429da64dda9dc01414c696a54c.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_fe1767f0177b460187db4ebfebad6a5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cba6e39-879a-48ae-a7f9-dc9a51efc48d/79310855219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8cf55f-ee3e-46b7-a91e-7739d055df89/krk_rokit_g2_vs_g3.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_66bd5bb5939f4e58a0b7d8a04a6e5935.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f85c04a-48f7-4c03-a7e6-e35537442ff7/hansel_and_gretel_get_baked_review.pdfIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_2dbe78b39b7947b6935cccd3f10fbf9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f75113-e3a2-467a-83fe-16bbf1801358/business_psychology_colors.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 3072 bytes
SHA-256: 31f4d3ccf843513b7200e4c8aa3deb1f22ce7852d87d73f0890d7c9cef89aa2f
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 5256 bytes
SHA-256: b359cd00a3d4afa5393fa5bb24b85d51e75ff2a49b8f38e32cdf4429834e4ec7
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 11028 bytes
SHA-256: fcccdbd85c61930d6eb3e867d4ded30f6e2e66d1b8b8c62227a1b456d9f93a61