Malicious PDF — malware analysis report

Static analysis result for SHA-256 4720b73b287a966c…

MALICIOUS

PDF

78.6 KB Created: 2021-05-11 14:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 624c7c670ce14e58fb970142348b1104 SHA-1: d3304ddfdca11ebabc4e2470c4c8f706968cb995 SHA-256: 4720b73b287a966cf66ee113d12d588f619800ac90f1b38d6811652edbdd686e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document body, though heavily obfuscated, contains text related to 'Conflict resolution strategies' and is associated with a URL that functions as an SEO redirector, likely leading to a phishing page. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/strik?utm_term=conflict+resolution+strategies PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470226/normal_5fe0095000f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fd1370a1c047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_605c1f8d4f29a.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/j0D03ge/69052463376.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/bheFtsS/wazorizusorenanovubugib.pdfIn PDF document text
    • https://cdn.sqhk.co/bopopujag/Oiimijg/wadesumedukofukapate.pdfIn PDF document text
    • https://cdn.sqhk.co/jozunede/ib4Vygg/corel_draw_x4_crack_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_6019add025a21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_604784e70838a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_6056775069569.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/ickzgd8/pot_stickers_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/gusejemife/iaRNXqF/97498911231.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/ljfSjdM/31649931344.pdfIn PDF document text
    • http://voicebftyi.com/totilomesimonakebi0r1x6.pdfIn PDF document text
    • http://topsalon.xyz/sundara_kandam_in_tamil_with_meaningipsou.pdfIn PDF document text
    • https://cdn.sqhk.co/biwufudi/egjnRic/mavarive.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/6XjwijB/pinball_wizard_lyrics_glee.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/gggijam/luzumatafufaxofa.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
    • 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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 4956 bytes
SHA-256: c7fc7e707716d78130ba9b38682f1966dcde4ed7c9cbbb7de164d66f5a2ed048
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10392 bytes
SHA-256: 9c79a9cfa9ac49c8dc59acdf51af8c9efd9a5be12b11abd3ce572fa524d61b90
font_02_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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