Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e8ac135b04b543…

MALICIOUS

PDF

66.6 KB Created: 2021-02-28 12:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 56d1fb939e161cc6f4d4734bf6075140 SHA-1: 570bd5fe509aff47bd09f3fad37419912b79d759 SHA-256: e8e8ac135b04b5439216d7c86bac48bf5dc3d6c63cc4d0b3b94ec187f8579758
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'bologen.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of hosting multiple links on disposable domains, reinforcing the malicious nature of the document.

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://bologen.ru/wix?keyword=funai+dvd+vhs+dual+recorder+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fd79f8801aff.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/IibvhgC/mezuvedijirifuxewapenuxum.pdfIn PDF document text
    • http://ig-mediateam.net/408330734030qckw.pdfIn PDF document text
    • http://power-guard.shop/kaplan_mcat_practice_test_book3h7sj.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/WEyNigf/ncert_solutions_class_9th_science_chapter_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367912/normal_60017b6025376.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/7jbheSO/xekatusiwilenuvupade.pdfIn PDF document text
    • http://gazzsheff.xyz/swiftkey_apk_kitkathowqr.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/ajhWKjj/senator_roy_blunt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368467/normal_6001c6486f088.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/pgQObjc/color_flashlight_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/gGzIif4/magic_wand_tool_photoshop_2020_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_602fd8f480a48.pdfIn PDF document text
    • http://igcopyrightclient.com/fluir_una_psicologa_de_la_felicidadnv5ws.pdfIn PDF document text
    • http://bilet-pdd.site/where_to_get_a_bose_wave_radio_repairf6f2i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/saxefi/french_english_dictionary_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/diary_of_a_wimpy_kid_long_haul_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/sukojuvam.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_off0000c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 5192 bytes
SHA-256: ebb1574f6d926ec41438d59bb66947347949030eec621ac2cce6dc640b06d242
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 10280 bytes
SHA-256: e6097403c0825a48c581a2ef6b131e1613003d0c5eb0fd26dcb42acd20e8af71

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