Malicious PDF — malware analysis report

Static analysis result for SHA-256 396f50d45622933a…

MALICIOUS

PDF

80.1 KB Created: 2021-04-02 19:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00dc554e6895a7db460825cfa4e73219 SHA-1: 0ffe7827eccf798af818a24e98973659bc40bb2e SHA-256: 396f50d45622933afcb3880460ee58eeb0306129ee967c881b0cfbf88c599d9f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers. While no scripts were explicitly extracted, the presence of numerous suspicious URLs suggests a download or redirection mechanism is in place.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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/123?utm_term=addons+f%25C3%25BCr+wow+classic PDF link annotation
    • http://easycreditscore.info/93558929547nllta.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/shadow_and_bone_netflix_series_trailer.pdfIn PDF document text
    • http://sexesex.site/what_is_a_good_a1c_number_for_diabetesi6ff1.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/62635494159.pdfIn PDF document text
    • http://ru-dev.xyz/xeroborezigewuwaw5m965.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/national_museum_of_american_jewish_history_store.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/71808379410.pdfIn PDF document text
    • http://world-wildshop.com/tremor_cordis_meaningwxdyp.pdfIn PDF document text
    • http://libralab.digital/629421801003wr92.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/pizagorilonekuteb.pdfIn PDF document text
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/ponofukuwubaki.pdfIn PDF document text
    • http://fabermanufacture.ru/the_complete_penny_stock_course_free_downloadi1lrg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanugifop.atwebpages.com/math_algebra_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9b898e-93a4-4c18-9683-05fd18abd68a/maytag_bravos_dryer_parts.pdfIn PDF document text
    • http://xonolori.atwebpages.com/9582285766.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/48171217831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b4debc-61e6-45ec-9fba-9fcf176c79d8/10605263417.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_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 5216 bytes
SHA-256: 76b644e9acfc768edfb50b15887d916b85f5e66537d6fc7b6eb3e21570c1daa5
font_01_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 11496 bytes
SHA-256: bd5c1c83ede675d041075a53e5f4c8e82a9394673dae7ad6443d50f34e432b16

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