Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a488bfbf45e158d…

MALICIOUS

PDF

83.6 KB Created: 2021-04-10 16:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 310c6a2301d9e3361153541a5e33d4f4 SHA-1: 19101d33a5e0823cb856344a299f8cf36ce2a3bb SHA-256: 1a488bfbf45e158d94c89ad8e5cc09752dec7dc06a0fdf62510155e81324f7c3
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it functions as a link farm on disposable hosting, aiming to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to pairing earbuds, which is likely a pretext to drive traffic to the malicious URL. The presence of external URIs and a high ML score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=how+to+pair+skullcandy+wireless+earbuds+together PDF link annotation
    • http://bigchance.pw/rigitebovaramabutuluzgh1dd.pdfIn PDF document text
    • http://befemuvejizu.22web.org/99473214270.pdfIn PDF document text
    • http://tipatav.22web.org/company_of_heroes_2_mods.pdfIn PDF document text
    • http://psylath.com/mantis_tiller_carburetor_rebuildvjqoe.pdfIn PDF document text
    • http://karupumad.22web.org/55143713733.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/all_clad_slow_cooker_replacement_parts_ac-65eb.pdfIn PDF document text
    • http://braco.ru/vipoxefawozeluab2dv.pdfIn PDF document text
    • http://onatural.space/2242826722zfe6l.pdfIn PDF document text
    • http://shimano-stradic.ru/46912203315884s3.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/czYhdjh/asrock_audio_drivers.pdfIn PDF document text
    • http://useraisins.pro/gps_compass_appq3cp1.pdfIn PDF document text
    • http://iranianvc.com/zegibazikagutiwjl.pdfIn PDF document text
    • http://islandlandscapesbb.com/10420360971x0cf6.pdfIn PDF document text
    • http://kismyketio.com/912389873662z27g.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/uH7sLie/wuzupirazunujogixodivumup.pdfIn PDF document text
    • http://firstreadersclub.com/phase_ten_card_gamer7cez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bovofekigigewij.rf.gd/java_tutorial_for_beginners_ebook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd83878a-a78e-4df9-aa82-a71f5d190ebd/bogimo.pdfIn PDF document text
    • http://gumofiwulova.epizy.com/periodic_table_ocr_a_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2346b9a8-d5e2-4a05-9165-1dcb7245b154/interview_questions_for_high_school_students_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685f4c46-9384-476e-bff0-8957e1ae260e/worosotupiboxev.pdfIn PDF document text
    • http://duvodix.myartsonline.com/gewuzukebizanaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d749ad-86d1-4ab7-b3f0-4a7beb734886/3387237319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d39b4a3-40ab-470d-bc16-ee6c40b2c8c2/ruzavukal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 5576 bytes
SHA-256: f5627c0f11bcd7dee9967a2528baead697c1579907d72ddbf254886d4470e2b9
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 11588 bytes
SHA-256: 3dbd7506f829e0c89ea489633ffad6b71575ec4aa81229c4cdea9c83f1829421
font_02_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3