Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e990ef48f502a5…

MALICIOUS

PDF

73.1 KB Created: 2021-03-26 18:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 869520252fe0bf6828c7e84b51271968 SHA-1: 765da9f477de5353623b5960e1b161e62d37af0e SHA-256: 80e990ef48f502a5d121ff630b529e15312126f2f50160c1b46fcbbf7149a784
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://zajinet.ru/strik?utm_term=mq+error+2538+amq4059, is directly embedded in the document's metadata. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=mq+error+2538+amq4059
    • https://fazatirogefo.weebly.com/uploads/1/3/4/4/134462354/2385535.pdf
    • https://cdn.sqhk.co/pananumujo/ejbjbij/download_game_dead_zombie_shooting_mod_apk.pdf
    • https://cdn.sqhk.co/sobilowibid/ibhhFON/among_us_wallpapers_creative_names.pdf
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/pumivotuzu-mapagejok-sukefowejujiwe.pdf
    • https://cdn.sqhk.co/nopawuwam/eTfgghf/73814697457.pdf
    • https://pofomagod.weebly.com/uploads/1/3/1/4/131483550/sewidijok.pdf
    • https://cdn.sqhk.co/mupalewefe/9Sib4FT/dipson_movie_theater_hamburg_new_york.pdf
    • https://tusanoxoledaz.weebly.com/uploads/1/3/4/7/134741707/5601e9.pdf
    • https://wadewasugidaf.weebly.com/uploads/1/3/0/7/130775384/3010885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wafijavira.rf.gd/39640962633.pdf
    • https://s3.amazonaws.com/tiduro/tewukutafapedunurav.pdf
    • https://uploads.strikinglycdn.com/files/604f6d47-c724-4077-b7e2-1fbb2d2b2128/how_to_play_c_scale_on_violin.pdf
    • https://s3.amazonaws.com/xazarujokemus/god_of_war_ps4_full_game.pdf
    • http://bimilenalo.rf.gd/android_9_fr_samsung_tab_s3.pdf
    • https://uploads.strikinglycdn.com/files/10adf0c7-a6ee-4976-afc7-6b77b23b8fe8/lg_tromm_wm2277hs_error_code_oe.pdf
    • https://s3.amazonaws.com/xomepixo/19961669726.pdf
    • https://s3.amazonaws.com/zesixefe/ejercicios_para_aprender_los_verbos_irregulares_en_ingls.pdf
    • https://s3.amazonaws.com/sesijesule/navunixetepaxu.pdf
    • https://s3.amazonaws.com/bupaxomu/80805547062.pdf
    • https://uploads.strikinglycdn.com/files/13674969-2256-4c23-bef1-313c9b7e60c4/1624173777.pdf
    • https://s3.amazonaws.com/zuxime/dufefevuratalozuzetivod.pdf
    • https://s3.amazonaws.com/tezofuretejom/sojeloguleno.pdf
    • https://uploads.strikinglycdn.com/files/4f1f35aa-d4cc-496b-a4ae-53a2ee58e149/53898874387.pdf
    • http://xewenofos.epizy.com/prefix_suffix_worksheet_for_grade_6.pdf
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd57.bin
5cf6b88f86a4e640ae7ea8a7107769c759e001752dc0925892ea79dd7e0458db
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 5752 bytes
font_01_sfnt_off0000f0e3.bin
0911f9bd33cae8139b85b839d043bf945ce2227ca7bd69f69063998a3f4bf905
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 11452 bytes