Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc69e4da4ad8afa7…

MALICIOUS

PDF

79.2 KB Created: 2021-01-30 05:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 88a010633ae4155332ae77bc7bea82db SHA-1: 820f914b9b0eeca7c97e6f3f44017e4609a1a051 SHA-256: fc69e4da4ad8afa7f2f73e9db96c7b2dfc42e8ee5be152ced019e1652feb7702
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to lure users to malicious sites.

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
  • 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 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.
  • 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://yafferge.ru/aws?utm_term=informer+song+release+date In PDF document text
    • https://cdn.sqhk.co/romilononove/hiaKJid/mi_top_scorer_in_ipl_2019.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/fumowinezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474191/normal_5fd046591dc6d.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/ggqgfgi/xasumidoxowuz.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/cd066c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377647/normal_60068f95ae886.pdfIn PDF document text
    • https://bexulijariva.weebly.com/uploads/1/3/4/8/134885506/1854038.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/cBjanbO/live_video_streaming_software_for_windows_10.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/c48a4238c41426.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/tobaziw/vowugurusomazukoveweraxod.pdfIn PDF document text
    • http://jugikan.epizy.com/boy_like_you_kesha_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/academic_writing_ielts_answer_sheet.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/gelezazipidekamezukepo.pdfIn PDF document text
    • http://kofukobekageja.epizy.com/97735846130.pdfIn PDF document text
    • http://kamaxunavag.epizy.com/72605088070.pdfIn PDF document text
    • http://deketinak.rf.gd/42199964965.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/cyber_attacks_2019_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/aging_report_in_sap_bw.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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 5164 bytes
SHA-256: 0557b0a4cd7af2d55ef4e9497fa0f36ff7bbe543b1b6e6c39669f26037c04022
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 10688 bytes
SHA-256: bcd886c929e11adac036db8a7b4fc839c623cef6e2d263f2f1bd63bfa2837dae

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