Malicious PDF — malware analysis report

Static analysis result for SHA-256 527d351c52eb89fa…

MALICIOUS

PDF

164.8 KB Created: 2021-02-25 07:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 727e7101fcb9acc5c9cd8c7e29b8fa66 SHA-1: 7f4292a85e20c1fff189a456127acc72f7a27133 SHA-256: 527d351c52eb89fa4fcbeed18be43af9a07ec60e29a96caef46566839729e7ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with the primary one being 'https://jacksth.ru/strik?utm_term=which+prophet+performed+the+most+miracles+in+the+bible', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, but the presence of external URIs and the overall detection profile points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jacksth.ru/strik?utm_term=which+prophet+performed+the+most+miracles+in+the+bible PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fc9d71059d90.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/vanedozikezisevile.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/80710554309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_60178932c276c.pdfIn PDF document text
    • http://in-step.shop/singer_simple_3337_bobbin_case_problemsyerzq.pdfIn PDF document text
    • http://uuuuull.space/get_any_number_call_history_apk3t0qm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_60289d39ed6c7.pdfIn PDF document text
    • http://powerhdniy.space/paraphrasing_sentences_exercise8jyyg.pdfIn PDF document text
    • https://vemesefopega.weebly.com/uploads/1/3/4/6/134684253/973545d.pdfIn PDF document text
    • http://lg-copyright.com/kubebadonhdtf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fd039cc250a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofideb.onlinewebshop.net/76488242090.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/cant_access_my_wd_my_cloud.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CFF 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off00021782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21782 5548 bytes
SHA-256: 97d828235b1f21cc9b296c4d457bd9a13231d35cb2824feb4f30bf3a13a67795
font_02_sfnt_off00022a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A3D 16028 bytes
SHA-256: 5fac41e1daac44fd5f4316ce8d80cba99099ba5a5fca3696ca79f5cf2ce92a46
font_03_sfnt_off00025d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D18 16540 bytes
SHA-256: 6c1bc335b1e9c982b063ed4f0ef2625071b169fff0447f9e75f41e2b4c28f14d
font_04_sfnt_off000273bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273BC 6408 bytes
SHA-256: b7559bf8a36419e37100babb8e6d53b085c45881561e065e0e0cfe1a19bc5fe3

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