Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fd24e5f431a7d9…

MALICIOUS

PDF

109.1 KB Created: 2021-03-25 13:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2122988c3c1003e1ef49dd48eafa432f SHA-1: 73705db8e6a67dff2d62707f6073f22c3e0566b5 SHA-256: d8fd24e5f431a7d9522729319d2be6dd2a764ce9fa0631d6fcb7b467e1f06d8f
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics and ClamAV as malicious. The ML classifier also strongly indicated maliciousness. While the document body is heavily obfuscated, the presence of external URIs suggests an attempt to redirect the user to a phishing or malware distribution site, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/123?utm_term=emerald+tablets+of+thoth+complete+pdf
    • http://juwupexutaval.mywebcommunity.org/ranger_boat_dealers.pdf
    • http://myfoxing.online/15304201253xc1d6.pdf
    • http://doctorzlo.com/wuvirirowurobasaxa77900.pdf
    • http://giwosesupalu.medianewsonline.com/cbse_guide_for_class_10.pdf
    • http://lebizifijafaxim.medianewsonline.com/de_que_se_trata_la_obra_cien_aos_de_soledad_resumen.pdf
    • http://ufenmac.com/why_is_the_red_standby_light_flashing_on_my_samsung_tv188wx.pdf
    • http://voicebftyi.com/17901099147q3vpg.pdf
    • http://leririv.sportsontheweb.net/xujuporisoxanuvutaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoxaneral/fevawisuxamufukewuxapok.pdf
    • https://uploads.strikinglycdn.com/files/fb3ae316-6137-4b1d-a9c1-8b9779533ece/nifumepukife.pdf
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_fdf6d2fdc89d4c248c4cf2997c6c7390.pdf?index=true
    • https://s3.amazonaws.com/lijopavexanuse/xomoliguzibubek.pdf
    • https://s3.amazonaws.com/kudufigunabi/zepojikurefigojex.pdf
    • https://uploads.strikinglycdn.com/files/6a1803fb-a923-4ca3-9c44-c158484039f0/average_weight_loss_on_21_day_sugar_detox.pdf
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_6d50f88edad7408c87307f597074c721.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b07d55cb-cb84-467c-87eb-b859e0c9ea4a/95641180020.pdf
    • https://uploads.strikinglycdn.com/files/3d22446b-34af-406b-aded-922ec4e02797/how_to_do_the_google_thanos_trick.pdf
    • https://s3.amazonaws.com/womirofop/wekaxibamujosakafipi.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_42ed49fef5ea4b768512957b9111efd4.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017475.bin
88ccd82b488f01a62b1d8ecd6976098a6053965b2d89220ffc1556767bf02f0e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17475 28640 bytes
font_00_sfnt_off00013327.bin
c463773fd3b9d69249d7256964f40dbda64832dc906c0eac9f483c5a2687b2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 5492 bytes
font_01_sfnt_off000145a0.bin
36717f81f943c404bf8de16daaddf9339ea1393fd25db24081487b3ae2019aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 15576 bytes

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