Malicious PDF — malware analysis report

Static analysis result for SHA-256 1557315cf090985a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-28 08:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8ca746493bfab1ea46d9f5ba9c6493a9 SHA-1: e16d77fc6f60a42d2a144e7f2408d3b9e609749a SHA-256: 1557315cf090985af5989ca11c5b26320d48e8b6fb48578d62af857c972e6bdf
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'fire protection'. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=active+and+passive+fire+protection+pdf PDF link annotation
    • https://cdn.sqhk.co/dabozijide/gjjdhhj/left_4_dead_2_mods_minecraft_zombies.pdfIn PDF document text
    • http://bnl-jobs.com/36402499235a5slw.pdfIn PDF document text
    • http://qwert-ita.fun/ad_blocker_spotify_androidvinbl.pdfIn PDF document text
    • https://cdn.sqhk.co/wevodapobu/evFgiPN/61713467187.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/oE7duyZ/sheets_of_plywood_for_flooring.pdfIn PDF document text
    • http://wotanute.22web.org/99586695820.pdfIn PDF document text
    • http://copyrightshelpcenter.com/vasadezigojerulemokuwa4v.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/TEQ0iij/snake_island_movie_in_tamil_download.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
    • https://uploads.strikinglycdn.com/files/929bc01b-68c4-4a9f-abd2-6e53fedc60d0/62643336537.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_19bc9d9c0ae3442bb0c061f895f4c8dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cccdaa-eac4-49f3-a7f3-4fe53f932054/what_does_beaucoup_trop_mean_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa7d965-f1b9-4ad0-aee6-8d047b055075/21800918318.pdfIn PDF document text
    • http://lenaxepejo.rf.gd/convert_to_word_document_online_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d7c4c2-b229-4d25-a434-03230dfbb159/64984292404.pdfIn PDF document text
    • http://dinoxisajuz.rf.gd/blur_editor_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40041f61-914b-4ef7-ba9b-98fe4feddc0e/jvc_kd-x320bts_bluetooth_delete.pdfIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_275a71fc5b7248db830d0a40196ce844.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8e0a28-3759-404a-911c-b48674d7fb47/05_chevy_malibu_oil_life_reset.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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 4956 bytes
SHA-256: 3ce796c22f69b1f08eb03bdea1b50cf330f47a560f620d2b1904767791c66e8c
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10712 bytes
SHA-256: 2b8d2451cb1f3d1f7e9d5211c678241d1db7fac6c11e732fdcafe2e3ce155f42
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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