Malicious PDF — malware analysis report

Static analysis result for SHA-256 637f7f6dc6e1e52d…

MALICIOUS

PDF

84.2 KB Created: 2021-02-14 22:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 678c93e4f4c43f8388dc74e05788a8ad SHA-1: b28ac6f00f4fb4daab7f1ec9514e02fda85df6cd SHA-256: 637f7f6dc6e1e52dc32d76e162594b076411141d3e5967e105975c2ab704ca40
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it acts as a downloader or redirector to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'insurance and taxes quiz', indicating a social engineering lure.

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
  • 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://seumenha.ru/wix?keyword=everfi+insurance+and+taxes+final+quiz+answers PDF link annotation
    • http://stylecurtains.com/multiplier_par_10_100_ou_1000_ce2qt69f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_6016716d706bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fca4964aff0e.pdfIn PDF document text
    • https://jubekese.weebly.com/uploads/1/3/1/6/131606730/b5a3f.pdfIn PDF document text
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/426032.pdfIn PDF document text
    • http://nextauto02.ru/z3x_crack_36.1cm8jz.pdfIn PDF document text
    • http://arboozfilm.com/3259087488558yka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_6004e6b3bfc8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486522/normal_5fdfa7103a1b5.pdfIn PDF document text
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/5e26c3d6895a0.pdfIn PDF document text
    • http://pubgucbayim.com/kusuvea8rmw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_601d96bdda33a.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/chloroform_use_in_oral_medicinesjemb0.pdfIn PDF document text
    • http://gemobaraza.iblogger.org/91510710158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunijudodo.rf.gd/49186414315.pdfIn PDF document text
    • http://ledukuxadom.epizy.com/lofiwatam.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_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 5368 bytes
SHA-256: 6beba407c178dea5bbf00f6ec8d472cc38bd0a975a372f27ef746b48b738c9f5
font_01_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 11004 bytes
SHA-256: 6f2ce23c7aa56a6079e2da356059df4ba8adae65322c9664ba64248740f2060c

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