Malicious PDF — malware analysis report

Static analysis result for SHA-256 deca161a0dc9dcd9…

MALICIOUS

PDF

87.1 KB Created: 2021-02-21 14:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68008c02d2d0048e040982c4bb86b4a5 SHA-1: b7c5260d402d789263617920718904d16eddacfa SHA-256: deca161a0dc9dcd98dbf77363e3ff663d731139bbc4543b8b33ebc3e4725e69c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link leading to 'baarspo.ru', disguised as a Wikipedia search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=company+of+heroes+2+wikipedia
    • http://iranomics.com/emerson_research_smartset_clock_radio_manualr082f.pdf
    • http://winoraama.site/kelijid600p.pdf
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/fofezajesatepigur.pdf
    • http://in-step.shop/8266921614289w7r.pdf
    • http://mnatural.space/best_anime_wallpapers_for_androidfaz57.pdf
    • http://domensita.fun/23249156945di4ch.pdf
    • http://mscgis.net/set_up_icloud_email_account_on_androidi2vrf.pdf
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/9004c0d35bc.pdf
    • http://opssmall.space/168527546297b94x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gowebabuxogiro/cateterismo_vesical.pdf
    • https://s3.amazonaws.com/ruzaganog/seterupe.pdf
    • https://s3.amazonaws.com/gajakelegeza/image_er_chrome_addon.pdf
    • https://s3.amazonaws.com/sumesawoxajew/flight_pilot_simulator_3d_free_apk.pdf
    • https://s3.amazonaws.com/paxivogedewilu/pexejowa.pdf
    • https://s3.amazonaws.com/risalenefazozo/xifatajomifulasiloneg.pdf
    • https://s3.amazonaws.com/nabifovu/games_bike_unchained_mod_apk.pdf
    • https://s3.amazonaws.com/mefovu/dutanoberideli.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_off00011655.bin
f24994395abefeeb38f84d0007032bdd1d6a1e22253e6e30003f32d0034634da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 5544 bytes
font_01_sfnt_off0001291e.bin
2da30e3d25c0252fb98d7b613975f56b77e88d4bff121ba32c458b448e1f0306
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 11240 bytes