Malicious PDF — malware analysis report

Static analysis result for SHA-256 229716a23a4d5cb9…

MALICIOUS

PDF

75.5 KB Created: 2021-03-10 19:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e2a8ca9d01c5dc9d9e12b1d190b8270 SHA-1: b8cbc1cd0cf7936793549054219bb8469e4bb27e SHA-256: 229716a23a4d5cb9b105acfeb67a4c324122ac3fecef09a12ff45edf6782c3cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=advanced+design+and+analysis+of+algorithms+pdf
    • https://jexesatarufo.weebly.com/uploads/1/3/1/4/131437655/262597.pdf
    • http://kafofal.mygamesonline.org/26277901057.pdf
    • https://vuzanodunujow.weebly.com/uploads/1/3/5/3/135350892/foxif_kisutawifozuv_totumoxebima.pdf
    • https://fuvutefimege.weebly.com/uploads/1/3/1/4/131453053/2846511.pdf
    • http://gitikirazidapi.medianewsonline.com/dejobopojezu.pdf
    • http://reduslimitaly-ufficiale.website/bajrangi_video_hdqoytx.pdf
    • http://italiahot.fun/857931227694qqfj.pdf
    • http://lnstagram-badge-verification.com/2010_chrysler_town_and_country_for_sale_ontario6pg22.pdf
    • http://nupesupo.mypressonline.com/40482354248.pdf
    • https://soletobapikod.weebly.com/uploads/1/3/4/5/134582957/7de7b9c009.pdf
    • http://investorlands.ru/how_many_types_of_ports_are_there_in_computeryi7j4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuguvoxoki/bolens_spare_parts_uk.pdf
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_8a9914c79dfb44d2a7737e2c522dd509.pdf?index=true
    • https://s3.amazonaws.com/xisefowu/gofokizusax.pdf
    • http://nalasorujuwasop.rf.gd/3_phase_power_supply_at_home.pdf
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_39045e66a7764fcf80eee2cbd6e3526a.pdf?index=true
    • http://vomukosupes.rf.gd/bless_me_ultima_chapter_11-13_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d3.bin
9088c8861c1cb9b57fbe64acc12d2c52caa0cab8648666a8b70808bf9b5f001f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 5720 bytes
font_01_sfnt_off0000fd2c.bin
13f43da2c0c44d4c21308900dffc5fade8e149b005d98466894d80372e4b94df
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10488 bytes