Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1bbd2b79ad9616…

MALICIOUS

PDF

64.9 KB Created: 2020-12-28 18:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5f75f9a3f881eda45a75d07738df862b SHA-1: b4f3b7dbe37ff22e6ec421d4bb3625639fa48922 SHA-256: 1a1bbd2b79ad9616112f5550fbd8df04d2961c1b6fbfe82824b25a2e3c1ba7b4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded URLs, with critical heuristics indicating it functions as a redirector and a link farm. The presence of a malicious redirector URL suggests an attempt to lead users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly indicate a malicious intent to lure users to external malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=bottle+biology+lab+report+example In PDF document text
    • https://cdn.sqhk.co/legifenobir/6Jvudhj/mafibafodibaleguxar.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/kefadofoza-wegukusaruboxar.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/Mjbcibl/41422514618.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/QgdiaEM/fonepe.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/b7e9fb.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/RODjTD6/free_online_music_games_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/oig0Xgd/98594177800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5fb334b08d263.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/9256075.pdfIn PDF document text
    • https://cdn.sqhk.co/mixasuwekov/jinakMD/word_smash_crossword_word_stack.pdfIn PDF document text
    • https://daxuwolazu.weebly.com/uploads/1/3/4/3/134335064/3646764.pdfIn PDF document text
    • https://bopuxokefira.weebly.com/uploads/1/3/5/3/135300507/kosavuvitur_xapifak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 5320 bytes
SHA-256: 9be91c5a7fa18e017940088a2333cc0c772ef94cb319cae82e8c95848d9e1256
font_01_sfnt_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 9476 bytes
SHA-256: d60a86d12cb64a683c5f546a313afe792a161f6ea7885d262767ea5836734af9

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