Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff168d290bc680b…

MALICIOUS

PDF

75.9 KB Created: 2021-03-23 12:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f1e4ce561aad607627868c5b5ef1db70 SHA-1: 9cf388451bf4f93e6ae7f73be6e4232a0bf63ea4 SHA-256: 4ff168d290bc680b091fa84de10dc378209a57d809d4efd5a292d17d434da3f1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/wix?keyword=dark+web+vpn+apk PDF link annotation
    • https://cdn.sqhk.co/ximirujusuxo/iighad8/air_force_1_box_color.pdfIn PDF document text
    • https://cdn.sqhk.co/sofuxizago/Yj9hcii/guess_the_song_quiz_bts.pdfIn PDF document text
    • https://kebomekol.weebly.com/uploads/1/3/5/3/135349545/c15572e9bbcb1.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/b72ca90c082b.pdfIn PDF document text
    • http://basvuruizleme.online/mesa_boogie_multi-watt_dual_rectifier_schematic_site_forum.grailtone.comx0p5j.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/379cbeac7510e3.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/ejcEibI/minecraft_world_map_download_1._12._2.pdfIn PDF document text
    • http://snt-br.ru/6463162426z7aqo.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/zitund5126.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/jQGwjjn/33052869386.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/giejc6a/24385390245.pdfIn PDF document text
    • http://koparikamoze.scienceontheweb.net/61345026417.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/wosijuza.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/whats_a_narrative_poem.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/2445418.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/a9Q6Whc/pioneer_woman_pico_de_gallo_and_guacamole_recipe.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/9305049484.pdfIn PDF document text
    • http://strapslap.online/chandramukhi_movie_full_hdg4wud.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/daraniwekamidir/40649682002.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/can_you_learn_physics_on_your_own.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/how_to_repair_a_mr_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/rectangular_prism_volume_worksheet_kuta.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 4956 bytes
SHA-256: 4d39bbf34fc1ab542c71c3fe318153870ce0831474769cb4e7f3dd7f0d4152a4
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 11104 bytes
SHA-256: ead11e686946326bc4706bbfd6c58ccbdaffebbb8ca227acb39df3839689d446