Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea346f3ac057ea2c…

MALICIOUS

PDF

89.2 KB Created: 2021-03-01 01:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a2ad07cdc195e24a462aa9e49880c410 SHA-1: 22c1973de599f85878b84b18e89019d8475e4d4d SHA-256: ea346f3ac057ea2c6e92cf81d00a24855af059ad9549d99f957d498469ca5d75
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, and one critical link to a known malicious redirector at `https://crophysi.ru/wix?keyword=word+whizzle+insurance+answers+places+on+the+web`. This indicates a phishing or scam attempt designed to redirect users to malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=word+whizzle+insurance+answers+places+on+the+web In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481406/normal_6036150e187a2.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/hd6ghih/tool_kit_for_women.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/why_does_my_kitchen_faucet_leak_at_the_base.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_601005df8d63e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ff3779ad8f3c.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/does_my_honda_civic_have_a_recall.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/3RQijji/gutixavizar.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/jegiIjj/rosorore.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/Z8ldBuX/30674737847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443803/normal_5fe3bd1b6a2cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedure/xujuzekelikabunikazuvori.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/64227322402.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/which_word_best_describes_the_mood_of_the_weary_blues.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/win_10_1903_admx.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/wogodiwegivo.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/excel_formulas_list_with_examples_free_download.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_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 5456 bytes
SHA-256: bff2d89d59224798b4fc97eb92f204be5192f6f239f72793b1d2becfc286b0d0
font_01_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 10656 bytes
SHA-256: 69124532ffa026c3e7a785feb1fe0d1540422cf27f0b5814b43e28f884e18665