Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dae053b6977428…

MALICIOUS

PDF

79.0 KB Created: 2021-04-17 11:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4bf968147caea34c1ad130b58da87545 SHA-1: 54ca6683e5505e0e9d2956772bea7052865cac4d SHA-256: 87dae053b697742866e7c0b0d48d3870e4618e1f2d186bc3b0164b053025b995
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and redirectors, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing lures designed to redirect 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://dafemum.ru/strik?utm_term=what+is+navient+phone+number In PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5fce010a19a47.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/fhiwyia/80954926642.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/xabizozeke.pdfIn PDF document text
    • http://gufolitif.22web.org/52822020665.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/supixemeluk.pdfIn PDF document text
    • http://raifaisentgo.online/588139612018tays.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/AKgd0J3/pefulowazozom.pdfIn PDF document text
    • http://copyrightmediahelp.com/40774004782vc8fp.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/madotivibawavofuhy61w.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/50191461916.pdfIn PDF document text
    • http://fisijowizaraxot.iblogger.org/2084910595.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/roxokovewikuxoruxerimex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403556/normal_60052b40ca6c1.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/f3heiij/38103053211.pdfIn PDF document text
    • http://instup.xyz/lagu_ost_school_2015_ilkpop8tpge.pdfIn PDF document text
    • https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/9933a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_6028a25e8698e.pdfIn PDF document text
    • https://zapirugitoz.weebly.com/uploads/1/3/4/5/134508168/bowofadedufot.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://gixiluvigatekij.atwebpages.com/apraxia_de_fala_na_infancia.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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 5120 bytes
SHA-256: bef51fb581523abe020b3b5e22f6ece77b30a7889d5ae5d94d11a079b385e195
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 11468 bytes
SHA-256: 1a9d34f3ee2f23d87114e8ba8558dc7a6d33f82ae171b676a2974c0349f74cd9
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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