Malicious PDF — malware analysis report

Static analysis result for SHA-256 da676323dcc62c8c…

MALICIOUS

PDF

78.0 KB Created: 2021-03-22 17:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 613124099f2a01fcc5c18de049f95ff3 SHA-1: 7c83f66737d7d8c03efbe98e80868f4da06c2baa SHA-256: da676323dcc62c8c62b35cc1349f3df3190d0e833766e5a5940ca27560530152
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used in SEO farms or phishing campaigns to redirect users to malicious sites. While no scripts were directly extracted, the presence of numerous external URIs suggests an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pelibifir.ru/wix?keyword=8.1+apply+exponent+properties+involving+products
    • https://tetiwaxope.weebly.com/uploads/1/3/0/7/130776033/gezufamalona.pdf
    • https://rajidorux.weebly.com/uploads/1/3/1/4/131453086/venosimaz-rufasojelifuve.pdf
    • https://cdn.sqhk.co/webunojixisa/aT73mjq/91642394045.pdf
    • https://cdn.sqhk.co/temegolu/jfhijhj/59280604458.pdf
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/8432539.pdf
    • https://cdn.sqhk.co/lojibuwe/4jdiihe/rally_house_dallas_hours.pdf
    • http://desofudexe.22web.org/oxford_math_book_for_class_4.pdf
    • https://cdn.sqhk.co/tamoravuwera/a93giMn/bomber_crew_usaaf_dlc.pdf
    • http://zdsshop.top/viwawukawozunebuptbtzl.pdf
    • http://idealica-itufficiale.website/xuwezedipurolakof4527s.pdf
    • http://buloshnaya.site/how_to_use_a_foodsaver_vacuum_sealing_systemw5fcr.pdf
    • http://nout-prokat.website/asrock_n68-s3_ucc____wbqh3w.pdf
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/tusitukemibasuzim.pdf
    • http://profapp.pro/how_long_should_i_cook_chicken_on_george_foreman_grillqp97m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_0efbeb5c0c124af086805072aa91ba8a.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_aa954a38fa1e473e9d7a38fc56062964.pdf?index=true
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_9d4644fe01494c4495f2bc6b590b5449.pdf?index=true
    • http://nilevividik.rf.gd/np_antivirus_2019.pdf
    • http://rimaxuj.rf.gd/caller_tune_song_wapking.pdf
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_2986fa3998274537bf55ed4679592ec4.pdf?index=true
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_051af7eaf73046378daf762a56c609a8.pdf?index=true
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_386000c653854e8ab780a493fba90880.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_e6dacf8614b7447ea58b62305fca337d.pdf?index=true
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_867566be26e849669aa6a3f8938b1cdc.pdf?index=true
    • http://bumumewevebav.epizy.com/54389235181.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_bfddcd726ab348eabe9660dfbda89a83.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_12ae3cf993a8430b8673371175d738fb.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcef.bin
6bb6755ef9bad6fcf6d4d15ac507bc04661f3060436c9284e46526c4eff7486d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 8216 bytes
font_01_sfnt_off0000f2b7.bin
db5d42e359d6a461c4ef4e9e492510b03594c58d5d99155aeaa7eb69680ec1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 5652 bytes
font_02_sfnt_off00010628.bin
dc056e7f5b5992be888a6793caa228b32595dc9497b47f049bcf20918af19cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 10376 bytes

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