Malicious PDF — malware analysis report

Static analysis result for SHA-256 b699679b7e3dacdd…

MALICIOUS

PDF

74.6 KB Created: 2021-03-15 11:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3099469ec1cd5711651820a1364b226f SHA-1: ca00805f2cf34a3472ac3a41be4f5746053d8170 SHA-256: b699679b7e3dacddf2e5ca0f1f902f828d19eb9d71d79fac489d92a50096a0f2
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings point to the document being a link farm on disposable hosting, designed to redirect users to potentially harmful sites. No scripts were extracted, but the presence of embedded URLs and the link farm nature suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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=renewable+and+non+renewable+venn+diagram In PDF document text
    • https://gepumisi.weebly.com/uploads/1/3/4/5/134517510/tatodiwu_togusixuwe_nelalitu.pdfIn PDF document text
    • http://yeswins.space/arihant_differential_calculus_download7wlqi.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/amarcord_nino_rota.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409396/normal_5fe267da500f4.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/cae_exam_paper.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/labour_contract_uae.pdfIn PDF document text
    • https://kudezugomolalu.weebly.com/uploads/1/3/5/3/135331411/voxifejafedisu_mojizoluxi_fizaxo_wedubeta.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/are_nike_sfb_boots_authorized_in_the_navy.pdfIn PDF document text
    • http://lexaliki.22web.org/conditions_gnrales_assurance_habitation_axa_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407299/normal_5fee43e18cb8e.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/tesemuzawukako.pdfIn PDF document text
    • http://newyearshop.site/html_tags_list_with_examplesqjfyx.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/redojoxovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_5fcd45eeba16d.pdfIn PDF document text
    • http://logoped-samara.ru/21188207336vtld8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexixikix.epizy.com/71025295129.pdfIn PDF document text
    • http://gidobiladuk.rf.gd/51451812750.pdfIn PDF document text
    • http://mowesedapi.epizy.com/46399903219.pdfIn PDF document text
    • http://xuwanuxetoto.rf.gd/45455716682.pdfIn PDF document text
    • http://fulatunufesaze.epizy.com/do_blocked_milk_ducts_go_away.pdfIn PDF document text
    • http://bamoxopigodarok.epizy.com/83879801431.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_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 5264 bytes
SHA-256: ff81db0493541aacbd80fd48a3e264d941738c172b363f69dec75b431acedfef
font_01_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 10564 bytes
SHA-256: e322e8efecc74623ef511aa5ce17aa67d1879fdef52cdbfb4f2850bd27d3f60e
font_02_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 16184 bytes
SHA-256: 9f0a34c1c8580a66824eeb206b4db5062e8a486f3fbf57c55382584dc75a4ed5

Open this report in the interactive analyzer, or submit your own file for analysis.