Malicious PDF — malware analysis report

Static analysis result for SHA-256 682515324c107820…

MALICIOUS

PDF

80.7 KB Created: 2021-03-17 15:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a50fdd44a0a83d7bba38c1c3ee69e89 SHA-1: 16150949878b8317e72031c41dfa79aef9980950 SHA-256: 682515324c107820c8e7a8f1573349386693dc397a42d4d296ef3fa88e3f0526
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The embedded URL `https://resalured.ru/award?keyword=cicloalcanos+propiedades+fisicas+y+quimicas+pdf` is likely the primary lure, directing users to a potentially malicious site. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=cicloalcanos+propiedades+fisicas+y+quimicas+pdf
    • https://cdn.sqhk.co/zenekukera/hthhjdl/zombie_apocalypse_2011_movie_watch_online.pdf
    • https://cdn.sqhk.co/xagunetoxa/TMhboaM/85254500970.pdf
    • https://cdn.sqhk.co/temazajilib/r2gjiih/gatujezasotafavinedokiw.pdf
    • https://cdn.sqhk.co/vikafaselida/jCojfzl/13602999127.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_0cae366254a7482bbb5d1d378db70ef7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7685b821-8f24-4aa3-87fe-b1c4d7244907/linux_convert_latex_to_html.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_55e6e40fa5f4462cbbdb335b70682152.pdf?index=true
    • https://s3.amazonaws.com/gazivemon/how_hard_is_exam_p.pdf
    • https://s3.amazonaws.com/gomaxod/gopro_5_quick_guide.pdf
    • https://s3.amazonaws.com/nedijowewoded/new_sword_art_online_game_android.pdf
    • https://s3.amazonaws.com/kovozenamofox/when_i_was_seven_years_old_lyrics.pdf
    • https://s3.amazonaws.com/muvarelo/is_nikon_coolpix_l340_a_good_camera.pdf
    • https://uploads.strikinglycdn.com/files/45cad025-e216-4cb2-86eb-019ab7eae37c/38914831237.pdf
    • https://s3.amazonaws.com/mulerux/43571676941.pdf
    • https://s3.amazonaws.com/tugabijenovili/legionnaires_disease_risk_assessment_template_for_landlords.pdf
    • https://s3.amazonaws.com/kigavanus/77878499942.pdf
    • https://s3.amazonaws.com/tobaziw/what_is_music_appreciation_a_symposium.pdf
    • https://uploads.strikinglycdn.com/files/b247fc90-c01b-4bde-8c44-ad8bc42eb4b4/principles_of_real_estate_1_practice_exam.pdf
    • https://s3.amazonaws.com/tapexiw/mubudixatogoreloj.pdf
    • https://s3.amazonaws.com/tesodagiwor/33878829354.pdf
    • https://uploads.strikinglycdn.com/files/a211d42f-9f4b-4692-959f-0b78ae72ea4a/windows_10_games_free_download_softonic.pdf
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_ec2fa0df332a4581b57179e581ff65c6.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76d.bin
a16d78b4e765d5ee2bbe34147faa0d9708ca9f4bd36cf3b090d8d65c0d41a973
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 6548 bytes
font_01_sfnt_off0000f7c4.bin
226cbdcd288ed638eec1a4e615d5c4ba76af10ff69770f2fe2fccd1472d79bf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 5436 bytes
font_02_sfnt_off00010a34.bin
7c591a7f25eeb7b2abafb4293b7432f67f8907bd67f0b4e014e2683176399dad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 13364 bytes