Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5176c142f639e40…

MALICIOUS

PDF

79.0 KB Created: 2021-02-28 23:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 089649bafd6b937f3649d174f20b7b20 SHA-1: 274087325126eee47de7afe7054d31231975274a SHA-256: a5176c142f639e40f9790d1b18fc0e5a12e5eb159d5a4cf74f77cab8f4b33e4c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to external domains, suggesting it acts as a lure to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wb?keyword=two%20parallel%20wires%20carrying%20current%20in%20opposite%20direction PDF link annotation
    • http://istlan.space/sixuka8spm.pdfIn PDF document text
    • http://kungfumalibu.com/96146523818b98pg.pdfIn PDF document text
    • http://reduslimitaly-official.website/fakuwuvuluzagupoloved1zzww.pdfIn PDF document text
    • https://dapofawebowo.weebly.com/uploads/1/3/5/3/135347186/gomojamoxuxobamob.pdfIn PDF document text
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/vimiwogupulejol.pdfIn PDF document text
    • http://gachihyper.xyz/37805140825y26lq.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/botumimawekej.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/romeo_and_juliet_act_3_scene_2_line_47_allusion.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/jgcthhf/zezorumobisiwin.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/doom_patrol_characters_rita0b6b6.pdfIn PDF document text
    • http://bigwin-1xbet.fun/38299039854gjyd3.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/5511217b032ac42.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/hfgcvrc/aaron_donald_draft_scouting_report.pdfIn PDF document text
    • http://safetymirrors.xyz/assured_tenancy_agreement_scotland_templatexfp3v.pdfIn PDF document text
    • https://jinepesel.weebly.com/uploads/1/3/5/3/135346763/kivukefu.pdfIn PDF document text
    • http://shop-profildoors.ru/are_nascar_cards_worth_anything1v8hz.pdfIn PDF document text
    • https://woxarupuxanuma.weebly.com/uploads/1/3/1/3/131383908/tolimivuxa.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/97fe6.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/67933190384.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/KoYNphd/antventor_point_and_click_puzzle_adventure_apk.pdfIn PDF document text
    • http://manovina.mypressonline.com/35236505006.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/rimuovere_aggiornamenti_app_androidxwdm8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/tonumimijonimorejazetejan.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 5384 bytes
SHA-256: 3184abc03faf39b2988c8a27bcc2de67591da357648de3d8bf7756d1f381fc94
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 10436 bytes
SHA-256: 24dc3291032378284b21f2aa9de6ab86e23be43968327dc082f86d22dfe0cbc4
font_02_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357