Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbc46b80a82a09c…

MALICIOUS

PDF

84.7 KB Created: 2021-04-23 13:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea668572e84387497677d39573cbdf7c SHA-1: b3a539a4d6a511e58adb93fbadc7ac4a22b31b13 SHA-256: 8cbc46b80a82a09c557f91b4088f4092d2519f38213c985a271d20da38e029f8
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=what+to+eat+on+the+low+fodmap+diet
    • http://xuforaxi.22web.org/djamila_ribeiro.pdf
    • http://vostokzapad.su/82936490764gtkwf.pdf
    • http://myfirstsite.xyz/ghost_in_the_shell_characters7iszq.pdf
    • http://vir-tus.com/49706715514evwjr.pdf
    • http://bijeledi.iblogger.org/amigaos_4._1_final_edition_classic.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gonafoziguwewe/sony_trinitron_color_tv_remote.pdf
    • https://uploads.strikinglycdn.com/files/2825572d-0e3b-4b3d-945d-a21112ef413f/90161819083.pdf
    • https://uploads.strikinglycdn.com/files/be4e82b2-e2a0-46e6-9dd9-8b64e1b5011f/78665241294.pdf
    • https://s3.amazonaws.com/kakekojezutok/amazon_play_store_apk.pdf
    • https://s3.amazonaws.com/pujinit/apple_iphone_ringtone_free.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_70898bccbe864238849e8ec9b7ef76b1.pdf?index=true
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_6884f818d5664607ba1f6847896da506.pdf?index=true
    • https://s3.amazonaws.com/netinuwa/73621576634.pdf
    • https://uploads.strikinglycdn.com/files/ea5f2a93-c89e-4c20-8a3b-76b4f6c23f75/zuzetofobukotuki.pdf
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_e82855ce6a7b4e8e8c1779518fbbde07.pdf?index=true
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_c0215e1f1b1542c3b08fc23a6eabf7ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ed182ba-e9e7-4193-a083-da382c5781a3/46693034480.pdf
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_acb38a8bdaae4a2a8f40c9872960a774.pdf?index=true
    • https://s3.amazonaws.com/kumasala/xutejukeruboberevetokit.pdf
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_b144597934b54cbaa7af59aa04175eff.pdf?index=true
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_19527d82f0394d88b4947587784988cd.pdf?index=true
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_be6717fb29594640bc56c21ea26da9f3.pdf?index=true
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_fd1798388e9d495596fe0b50e1a01270.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dcd.bin
41f47fe243373b7eb6b64e04bf1b554105c84e36620fe48ec3bfa1d560ff675a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 5112 bytes
font_01_sfnt_off00011f2c.bin
a026dbf7e937c8fa52acd7d4b6b43416ae58df4a5e8c9bd4ccdbcc05666fc54d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 11052 bytes

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