Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf2780341e8c8a7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-19 23:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f433f03b449cb4e43d7ad93b9e2a3212 SHA-1: 9000b96a4a3100ab9ad50c1342307dd88164b5e4 SHA-256: dcf2780341e8c8a797ec88fd99412ecff5f5123cc5826b0df8d95e0133f20066
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains or cloud storage, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious or spam content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • 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://xajibur.ru/123?utm_term=hero%2527+s+journey+worksheet+harry+potter
    • http://webmastervlad.ru/real_driving_school_2017_mod_apkxqnsl.pdf
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/6710652.pdf
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/xalesisopifi-pojowifor-sobirisizi.pdf
    • https://loxajutuwaguxi.weebly.com/uploads/1/3/2/6/132681393/078cd44.pdf
    • http://domainlimax.xyz/4_quadrant_scatter_plot_excel_templatenm65f.pdf
    • http://sungo1.space/xovokumefuw2yomf.pdf
    • http://esclub.pro/how_to_adjust_sears_garage_door_openerpzbbm.pdf
    • http://azakalaza5.xyz/10469421720avpsg.pdf
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/8879939.pdf
    • http://just-gopro.com/dotukavewokoxxysq.pdf
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/3866019.pdf
    • https://lujiwosibe.weebly.com/uploads/1/3/4/0/134040634/zejasofeb_wamanudid.pdf
    • http://myfirstsite.xyz/484638833067359b.pdf
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/fozefuwotolibu-xisonuliloxu-joxukijuvotav-riruxetuxu.pdf
    • http://good-production11.site/frp_bypass_apk_to_sd_carde7snw.pdf
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/fedetesogas.pdf
    • http://sodahq.pro/jifubozogunojr157.pdf
    • https://gebawifu.weebly.com/uploads/1/3/1/4/131483167/5853567.pdf
    • http://noverst.xyz/canon_mp250_driver_windows_7_32_bitzsd5f.pdf
    • https://mefanajumajadip.weebly.com/uploads/1/3/1/6/131637152/dipabemele.pdf
    • http://martakkord.ru/81952597149f7ieb.pdf
    • http://pet-guru.shop/p90x3_workout_schedule_downloadpfs5r.pdf
    • http://anstel.pro/bhagat_singh_photos_freeepyg6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tesasubawalozan/91287167310.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/asus_zenfone_5_android_pie_review.pdf
    • https://s3.amazonaws.com/lanorolowu/baloretabatadevegedifur.pdf
    • https://s3.amazonaws.com/pizivurapab/18953943592.pdf
    • https://s3.amazonaws.com/suximawo/26971962712.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_off0000f71d.bin
3992f0a30bb11edd25f5e82cfd260af2cb012c01c937e1ef41d24710e0424cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 5204 bytes
font_01_sfnt_off000108e8.bin
d129da55a9d77e5329c4660d1696b8af3541134d29adcfbeee78d6100ce9a033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 11228 bytes

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