Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0b7f638526f3fb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 19:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0d57fa1c9867c0f7667777dd38b66615 SHA-1: 9d569955be17afeff70eccf3e3f16fb74834a776 SHA-256: 1f0b7f638526f3fbf1d53d0c0ef47de46cbc94bd64c2512e8d0d349d5aad8191
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=after+effects+apk+free PDF link annotation
    • http://upoart.com/ckfinder/userfiles/files/84894198120.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/74121074054.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/fomevebixujap.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/jefinapefapenazixew.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/ravefiruwuzaderapereri.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/54679961249.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/niselagumepul.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/40225482991.pdfIn PDF document text
    • http://unsersohn.com/images/file/sowutipimom.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/15434883347.pdfIn PDF document text
    • http://rcmo.ru/upload/files/5420951539.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/49255358549.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/divilukidunirez.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/duvunokegedapasuv.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2cf88fdeb635a9707a4875458ca9941a/fojuxuvu.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/minof.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/87112470103.pdfIn PDF document text
    • https://videoeffect.ir/data/file/74502083478.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/62539255088.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf8930a81---nigakirafe.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/3199220380.pdfIn PDF document text
    • http://vititanon.com/user_img/files/zuwozokavutorogir.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 10184 bytes
SHA-256: 44447a80a3faf7be83d2fe792482a48e5d46d2b563f7bb2ec4d7e889669d099f
font_02_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 21888 bytes
SHA-256: f6696dccb6ed3300086aa2f22757837cade661b685072b8505d1f626f2052d92
font_03_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 16276 bytes
SHA-256: 0bf8cf5b303e422d976e299adb1209ec022064ceece566cb2ef2e4afafb1076e