Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b202c59f8b6591d…

MALICIOUS

PDF

73.5 KB Created: 2021-03-31 23:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6f0caffca5fd10949de7298b1c1dfd3a SHA-1: 28512d5a68d7ca820d88eea38c39546523ce8d72 SHA-256: 3b202c59f8b6591d9a801d4a24dda1a34fd5c64839bad36f57e1636313bfda2a
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery. Although no scripts were extracted, the presence of malicious URLs strongly suggests an attempt to lure the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=poema+te+amo+infancia In PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_6007dee930a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_600017d3515e2.pdfIn PDF document text
    • http://organic100.fun/temple_run_game_2_video3aoj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_603c0338682a5.pdfIn PDF document text
    • http://storeeu.info/64260627124hr4ym.pdfIn PDF document text
    • http://hookup153.fun/digirazekuvozixrtn77.pdfIn PDF document text
    • http://forecast.bet/carambola_games_freekgdgv.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/jibopofopisofu.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/fatafovigerar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_60292aed497d5.pdfIn PDF document text
    • http://idealica-italiaoficial.site/titan_440_impact_airless_paint_sprayer_manualwsc6r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_605d13ab9861f.pdfIn PDF document text
    • http://bufo.online/sap_tutorial_for_beginnersg62w9.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/ab28d14d-cd2b-4d60-8ff4-1da9838c582d/tijusevalisexefaz.pdfIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_1a40b998b4204d1d9c7f9fdb017a8538.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_fe92277e0f224462ac8a89ec98ff610a.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_fbf34f22222c423485c7765a87c4072e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73eee63e-8b0f-42d1-9311-415b436c82b9/lawn_boy_phish_lyrics_meaning.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 4724 bytes
SHA-256: 0499b4b04c80a81334ea604ce7ec79938176e9b0f3febb21bef44d2d26aab4dd
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 11000 bytes
SHA-256: 3e90b0e462c712eeea5729a90d2fd43a1ee572fde95c58b7cd0bcc0cdaac86cc
font_02_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd