Malicious PDF — malware analysis report

Static analysis result for SHA-256 306b130aff435fa7…

MALICIOUS

PDF

131.2 KB Created: 2021-03-23 03:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5fc0d772afbbca55ad003b7ee20402c7 SHA-1: f5d78c29c166c243404678940697593693e8a20d SHA-256: 306b130aff435fa7eb562ba860a6a62cd115f01f8465aa27a48f84d62e65adfb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of external URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 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.
  • 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://vilenefex.ru/wix?keyword=generators+to+create+dct+file+in+stata PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472793/normal_6029226784214.pdfIn PDF document text
    • https://cdn.sqhk.co/lakabarobuk/fbDqgg6/flower_painting_ideas_acrylic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5fca0b8a19355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_6010cba51b2ab.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/kfoheja/zeredafodoxujuvija.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/Suqhbhe/gisefubovinonatabum.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/Aid4d54/vimugozoduropevagasi.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_6033f7f644a28.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofilexi/ghm65PQ/alarm_clock_download_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5fcece5c75c6b.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/gji9Gcq/harvest_market_champaign_phone_number.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/gewuwasi/samsung_model_rf26hfendsr_aa_not_cooling.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/91266903845.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/larugogajevijusovijitiri.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/kuxililopumu.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/1535436943.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_8aa00120bbd6438c95ffe80fafc3c07d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/meilleur_livre_pour_apprendre_l_anglais.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/c_form-_factor_pluggable_cfp.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/sharingan_live_wallpaper_pro_apk_free.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_dece67a05038499e8912ae4892ed78d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusori/kagikiwiwuwopapavemogof.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB9 6612 bytes
SHA-256: 93f9916a7c0d401b3f3ce7a7a3299ca960f219afb408a5a30c6dc66795a67ffa
font_01_sfnt_off00016ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CEB 20032 bytes
SHA-256: eb006982383c08adfb3af0a6c6d020377879ad627d6e67d7284d184ccbc24fe0
font_02_sfnt_off0001aca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACA3 5044 bytes
SHA-256: 0c9a614e009bf9cede17d88d6801c1284da041bbaca0a064104dabc544f944a8
font_03_sfnt_off0001bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDD8 13288 bytes
SHA-256: 72efa5758a16b0e24feeb78c9cba78dedd08f685dd1af6c3da9316d3a681a687
font_04_sfnt_off0001e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E98C 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953