Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2dab5171cfff9d…

MALICIOUS

PDF

101.0 KB Created: 2021-04-05 19:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2e9ac285e71d41332f62ebcda4fa8214 SHA-1: 3344b6776d0bea02c20680dcda64df84cbb66c17 SHA-256: 1d2dab5171cfff9d0a15ee49b082e9892955613c720b5b26ce937b6b67f88b0e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. One prominent URL, 'https://botokaw.ru/strik?utm_term=russian+alphabet+cursive+letters', is flagged as external. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the structure and URL usage are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=russian+alphabet+cursive+letters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427268/normal_604781fc49816.pdfIn PDF document text
    • http://kpovli.ru/gekalejaletopetokdeak.pdfIn PDF document text
    • http://ig-socialmedia.xyz/verbal_pronunciation_guidexiy0i.pdfIn PDF document text
    • http://tomogorman.com/how_to_study_science_subjects8olkk.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/das_aleph_borges.pdfIn PDF document text
    • http://siondez.ru/what_happened_to_the_grady_twins_in_the_shining0upqd.pdfIn PDF document text
    • http://gezinuduwep.medianewsonline.com/86653400669.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5ffdc47f3ca6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/jedikuf.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_ea89f0b53e5849d19ab3eac45ae79ddb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e880d63-3dd7-413c-b97d-e9f058c12c64/coaster_brake_hub_replacement.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_7b817ccbbafc469986f1146a04e5b005.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/ninemsn_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13397ad7-acce-4321-889b-207d5a1f370c/50644155478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445731d7-44c5-4c6e-9a56-0b035558b8ba/bokomiruzaveminaxozatobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90966749-27f1-4a5a-93ee-033717f8840b/3858924077.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/android_rxjava_chain_observables.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/98219392480.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
    • 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
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 12232 bytes
SHA-256: 6b173cce12d8cdcfe4475f663773df8adf69a2485e668f164a5ef29a22032e4b
font_01_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 3028 bytes
SHA-256: 313d63ce716c5dd54ab6dc6ba152a032174a600ec95b08abb975d2be5f4e446f
font_02_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 5228 bytes
SHA-256: 5c65be022b07a8439e2316ba7621be20c8d36cf489f6e02698d98f0ced978db8
font_03_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 18448 bytes
SHA-256: 16061fbcd88a82b73bd454b06ffb91bc169349db1119f32f2d293e7e796872d7
font_04_sfnt_off00016b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B7E 17448 bytes
SHA-256: 238cf28398dd144de7d80e8fdd7b7fccc98f4ba2b07a413b28aa2419a71adc47