Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c10448a94427de…

MALICIOUS

PDF

86.0 KB Created: 2021-04-02 00:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 98e35f9e328b678b04896dac5b3d09d6 SHA-1: db73dbed13c336f492fbf803e1357080c4490e17 SHA-256: b3c10448a94427ded4d24f37f28e1ae0eb6c190915534df35a92bf96177b8756
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL and the document body, though heavily obfuscated, point towards a lure related to 'subway surfers mod apk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/wix?keyword=subway+surfers+mumbai+mod+apk+revdl PDF link annotation
    • http://gexomafe.mypressonline.com/partition_of_bengal_in_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_600f57a777383.pdfIn PDF document text
    • http://novazeku.mygamesonline.org/15779630264.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/what_is_reiki_level_1_attunement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_606634dc236cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_5cf7eee27dc6423c97aeed0164ee0b58.pdf?index=trueIn PDF document text
    • http://vitipazapabixu.epizy.com/kogenes.pdfIn PDF document text
    • http://butasolijedaj.rf.gd/kajamakopomajazoxizobovek.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_cb9007028a6549b8a958358309433649.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_3e7bbd745c244990b22f08a4a94425ec.pdf?index=trueIn PDF document text
    • http://petojijoxura.onlinewebshop.net/spring_framework_guru_swagger.pdfIn PDF document text
    • http://zufejudo.epizy.com/26331749341.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_c75274cd9117401c9a10dd208d702e4b.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_1a981b90dd4f47c7b790b6a3f9f72118.pdf?index=trueIn PDF document text
    • http://zugepoguj.onlinewebshop.net/50129538423.pdfIn PDF document text
    • http://xalanijowule.rf.gd/retol.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_f088cd6a803b4c6b8fc44a0b7fa6915e.pdf?index=trueIn 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_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 5748 bytes
SHA-256: 0f83d201c079eaff4cd72fed12fe283ae825216da2d9e5bfc2f946f5f2ff6143
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 14728 bytes
SHA-256: fbfb6d287e39de8ae61e532e6b10d0a341291bc6d13f28e4234641d557eede3d
font_02_sfnt_off00013586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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