Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b200809d910333…

MALICIOUS

PDF

81.0 KB Created: 2021-06-08 07:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a15f6d23a40c6015a2e5c652774700e0 SHA-1: bdd438b5067e0ba15ece5cc37b27ff4a41c199fe SHA-256: d9b200809d910333af10b1573218cfc91a3d3cec75d900fbd1ba5e4bb0ffe268
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/123?utm_term=el+abecedario+en+espanol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fd273787b3e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_603533c77a3a5.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravowibosu.pbworks.com/f/windows_8_iso_64_bits_mega.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144523272/jlpt_n3_vocabulary_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e09944a-76c6-4164-b6e9-a9f1c7173476/what_is_the_difference_between_reverse_and_inverse_function.pdfIn PDF document text
    • http://fafevupu.pbworks.com/f/76916208022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4288f6-63ed-4933-ab2e-ac9cdedfbdb2/statistics_for_the_behavioral_sciences_9th_edition_solutions_manual.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/91348370467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e062cb-6550-4193-9ca2-b16c4504e59c/zarodexadofigumofetubix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da91b675-c5aa-494e-9667-abd5d7ca215a/sitivolutofedoleroxoxi.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144427869/anthologie_les_fleurs_du_mal_thme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf4c4db-54a1-4ffe-97a4-4fb5980532a1/briggs_and_stratton_28m707_rebuild_kit.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144423468/99539648150.pdfIn PDF document text
    • http://kutegazez.pbworks.com/f/how_to_solve_linear_recurrence.pdfIn PDF document text
    • http://vikiruji.pbworks.com/f/background_images_hd_1080p_free_download_for_windows_10.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/rekagewadisufukedari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c39eb9-198e-4890-9ee0-bd28403b74a2/the_hellbound_heart_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095382d7-242e-482a-bc4f-218a65e6f2d0/80654880516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2c53a9-4de2-47e8-92d2-89a67c948eda/kepajax.pdfIn PDF document text
    • http://tagutijak.pbworks.com/w/file/fetch/144841470/selena_movie_questions_worksheet_answers.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144466731/yugioh_duel_generation_hack_android.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/csr_racing_2_mod_apk_unlimited_money_and_gold_and_keys_ios.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/automate_the_boring_stuff_with_python_2nd_edition_github.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
stream_003_off00010271.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10271 3572 bytes
SHA-256: d878ad1eda93d8bff5998932762ff29f068b4f97138b684301e144a97064adac
font_00_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 5244 bytes
SHA-256: f3cf9eeb9fce0b20877c77ac15d185e57055215b8f701bf6affb56ff3b4cb097
font_02_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 11716 bytes
SHA-256: 0cd8fc26ada729c876cc158d99f934573bfc04e0642f88ad6cc2496d1f7ee09e