Malicious PDF — malware analysis report

Static analysis result for SHA-256 621a2b08d5a15a6a…

MALICIOUS

PDF

76.7 KB Created: 2021-03-29 07:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 044b8e96d2c5f5782f7605628bc6318a SHA-1: b425d8a204c6a85043883153bd46f68b714ae0c8 SHA-256: 621a2b08d5a15a6a64096bfa9b8a77f2a3c8bc717f73fef59d0551c13fb58604
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' and the numerous extracted URLs suggest the document's primary purpose is to redirect users to a network of external sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=disney+movie+quotes+about+life
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/kexetojezil.pdf
    • https://naleletilasimoz.weebly.com/uploads/1/3/0/9/130969891/9343256.pdf
    • https://namikefazexu.weebly.com/uploads/1/3/1/6/131606603/jexebovimajap_feteperato_muvufogimimove.pdf
    • http://dulisakip.medianewsonline.com/entrepreneurship_notes_download.pdf
    • https://lusizemanu.weebly.com/uploads/1/3/4/1/134108609/9c468ac8f.pdf
    • https://sowidokobixu.weebly.com/uploads/1/3/1/8/131856306/gusesapidi-merinaza.pdf
    • https://cdn.sqhk.co/livukigelo/jbjakqz/ruzowewa.pdf
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/7258d.pdf
    • https://cdn.sqhk.co/nedupugifuka/ihggFhe/zemuvasigexisuvodibavos.pdf
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/5915dfff9f6a442.pdf
    • http://fisujerekuvij.getenjoyment.net/mcdonalds_mailer_coupons.pdf
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/6051232.pdf
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/3cb2149c3c.pdf
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/delolitiwel_vokulivawotuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wupiwupiwot/72651886641.pdf
    • https://s3.amazonaws.com/limewub/xigunezaxevorukuru.pdf
    • https://s3.amazonaws.com/sojaxub/ccvis_form_16.pdf
    • https://s3.amazonaws.com/muvojugejoxip/function_notation_and_operations_worksheet.pdf
    • https://s3.amazonaws.com/fejififimaketo/suzibodexowizamigunalali.pdf
    • http://nabulegewuwal.myartsonline.com/56298354587.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbe.bin
b32aaec1da2a0d692bdfc14e8b4ec74dbc1645c4b85118f52db29e6ac4e92d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 5244 bytes
font_01_sfnt_off0001019f.bin
7b2cfe1424ce6e7575c03975e915a1b004a8bd95bc22a95af992867a78f7c386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10640 bytes

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