Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1493ba3c9dc496d…

MALICIOUS

PDF

75.8 KB Created: 2021-05-24 10:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 232356e9bce18757722da762711f4280 SHA-1: 3e92abce5d9868073e911e22298c93bf23f47d27 SHA-256: d1493ba3c9dc496d8bddfa340b1d52f67406b6ecbd5e4ecbee1e4f205718477f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a lure for identifying worksheet answer keys. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=identifying+primary+and+secondary+sources+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fc799b50b482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_6045f77cbf0c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6036d65328d17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_6059ad1366b31.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/4851383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_602f9703c8945.pdfIn PDF document text
    • https://binoxumo.weebly.com/uploads/1/3/1/4/131452823/govosil.pdfIn PDF document text
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/sedozab-sumonine-bemen.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/tijovude_moluxi_wunejuv_jilaj.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/zavepudafutevel_bopijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483331/normal_6003581853c87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366312/normal_5fc8f9d9e44e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_602116f26ea02.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/tabobujimo/xbox_one_booter.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/apple_marketing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/odia_album_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/74469843364.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/yahoo_mail_latest_version_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b890aa2a-6777-4b9c-b65f-7dc964b30639/end_of_the_world_2012_movie_in_tamil_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/askep_neuroblastoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb4ef92-eb7f-4797-a3d2-4fa91c77c2f7/zarumarubobomeretex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131f94a7-c408-4969-a020-705b070e6e9f/does_walmart_sell_beats_by_dre.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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 5732 bytes
SHA-256: aaf9aa99fa415d45b4d90ce88ea25d6f1731edaad8d25d6dd339f18c53e9ca28
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 10384 bytes
SHA-256: 921888d57c0f741cd3aa1e734b3cbad0323e0fce769f5cb609277c1190e1300e

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