Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c12b881fa1d9e1…

MALICIOUS

PDF

90.0 KB Created: 2021-02-11 08:26:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 685ab708bb4d9b968482dd8dc4cb3941 SHA-1: 1b1c13504103313ab8508ae25f2a814dd1a60b54 SHA-256: 16c12b881fa1d9e16de6e6ae8a834af1d43249f3a26d355e87f80afa5ff987dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a malicious intent to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains references to '2013 nle answers' and application details, possibly as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=2013+nle+answers PDF link annotation
    • https://cdn.sqhk.co/xulawajikigi/ghvfdas/teleplay_film_definition.pdfIn PDF document text
    • http://mkuu.club/charm_city_kings_full_movie_free_onlinexblzg.pdfIn PDF document text
    • http://creditreportusa.info/batman_arkham_asylum_mod_apk8ptvl.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/gjdCk79/city_car_driving_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/8hg1shc/mononigixilapazutoxe.pdfIn PDF document text
    • http://dalkomis.website/530485717643r5wb.pdfIn PDF document text
    • http://nesobaka3.xyz/25431721867eb3l8.pdfIn PDF document text
    • http://life50it.pro/application_form_korean_embassy5swz6.pdfIn PDF document text
    • http://repair-foto.ru/39066835868zp9z9.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/jifkAhS/baseball_trading_cards_target.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_601235c2c335a.pdfIn PDF document text
    • http://fumuponi.22web.org/18._2_electromagnetic_spectrum_worksheet_answers.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/camfrog_room_list_188skwd.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/6h5dVh3/delosilevepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jogupasowedeni.rf.gd/mitufilewevur.pdfIn PDF document text
    • http://sonevovavar.rf.gd/bell_bottom_songs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 5168 bytes
SHA-256: f30a6f115b5be9e51b3d125ac3d02162258b69764bc72ce823213d0ab3b34307
font_01_sfnt_off000132ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 12196 bytes
SHA-256: f575297cb4968d9d718a992d908459a1e9ec273f3334917f14cc3d46f3d97429

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