Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecdf8620772ecd7…

MALICIOUS

PDF

76.7 KB Created: 2021-04-04 07:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a03fc219515bbd4cc45e38dfce9234f1 SHA-1: 6b0fa4ee295355c00f96bef9d8b4afb699989008 SHA-256: 9ecdf8620772ecd7aa6885d4f04bc7d9d69b9e4617345d0c24a1eeed2d826f82
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and contains external URIs. The document body, though heavily obfuscated, contains text related to 'printable calendar 2020 pdf' and 'wkhtmltopdf', suggesting a lure. The presence of multiple unknown and potentially malicious URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/award?keyword=blank+printable+calendar+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453560/normal_5fd681c347680.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/how_to_pay_my_credit_one_bill_online.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/gafug.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/woginu.pdfIn PDF document text
    • https://walegizagoz.weebly.com/uploads/1/3/0/7/130775215/d41a89ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_6049eb31d952c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5ff42e101eb9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_6065df300fa71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_c4f0cca1994442e4b953ec3a34a5a982.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_c24f1eab768b4200b30713aa8f378367.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_747d510c6dcb426699735140cf284756.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_41cde83cd2ad444cb9bb077f85189217.pdf?index=trueIn PDF document text
    • http://zekafoweratum.epizy.com/aplikasi_video_editor_android_terbaik.pdfIn PDF document text
    • http://sajojuwew.rf.gd/7678433230.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_f5cf7e21aacf4b0e83067ef2ec49f03f.pdf?index=trueIn PDF document text
    • http://diguluzid.epizy.com/cabbage_production_in_uganda.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/thinking_maps_online_training.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_89572ac32b0e418e91ef2db599adab3f.pdf?index=trueIn PDF document text
    • http://tajiroxajesolut.atwebpages.com/club_car_precedent_windshield_dimensions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 5176 bytes
SHA-256: 4c0d22ca97682f0b73554bf433382cad8bcba1e0e96df9db126748740deea456
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 10532 bytes
SHA-256: a20ec7392108268d6f89f0b16d6cffcaddbadf84ea31cb5293874a9a91171928
font_02_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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