Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf8ca6b1af3bf1a…

MALICIOUS

PDF

85.4 KB Created: 2021-04-14 01:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4dade1b4c776c739706bfd0c65aedd59 SHA-1: 503a0649afcf81ed10ac8bde0fa18cbe37684028 SHA-256: caf8ca6b1af3bf1a58b001c6c3af704e59584fa9404612e8b9af71324cc79eae
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'discharge assessment form', which is likely a pretext to direct the user to the malicious URL for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://resalured.ru/strik?utm_term=mds+3.0+discharge+assessment+form PDF link annotation
    • http://fedumaf.22web.org/line_6_spider_ii_210_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/TUjgVpr/valid.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/iebG6yj/barfi_full_movie_khatrimaza.pdfIn PDF document text
    • http://kodutizaga.mywebcommunity.org/16052804650.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/hi3ChbP/lucky_money_exchange_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/ibjethe/compare_cruise_companies_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/4hjZ2ij/norijosogefurawamikam.pdfIn PDF document text
    • http://puviwaxeraw.22web.org/administration_dictionary.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/30226340507.pdfIn PDF document text
    • http://zegoves.22web.org/lojetimogawipo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jinufezep.epizy.com/betiyan_bojh_nahi_hai_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4e4ea5-74cd-4c18-b3ec-b8305f7f3ad5/examkrackers_mcat_organic_chemistry.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/76706195850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7076922c-382c-4493-9af7-88ec4810a08e/what_were_the_3_estates_revolution.pdfIn PDF document text
    • http://ginozegi.epizy.com/cheekh_ost_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/noletakulogojotuvusoralas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425a2c1d-33ed-4dcc-a86a-5b0a596d32c4/math_book_grade_7_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7af295c-85ec-4ee5-b8da-8d0dfacb0160/49537954771.pdfIn PDF document text
    • http://xaguxebijop.epizy.com/lugut.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/48423977456.pdfIn PDF document text
    • http://fabevurubojob.epizy.com/36863459219.pdfIn PDF document text
    • http://nopuwezivobevuk.rf.gd/bass_guitar_exercises_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/brobar_boli_song_djjohal.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 5536 bytes
SHA-256: 9e1dd1bd2b2cbfb39ca5a1cf8a3d8fd8fbe2f8e3601f1c69102b753f6b5c554a
font_01_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 11992 bytes
SHA-256: 069b81c49244ec1726aa2e79a62579eee1a44bde0e7499014d9366fbb3f8f573
font_02_sfnt_off000139bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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