Malicious PDF — malware analysis report

Static analysis result for SHA-256 5894447e7787e8f8…

MALICIOUS

PDF

71.1 KB Created: 2021-04-14 13:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d6d8e10afb55b30db458048440661e2 SHA-1: 4ed4a3aceb335f676680c03e63c8891376500c7e SHA-256: 5894447e7787e8f8eb6a0332d9498f711abc3b2ca8e15d9f7c00f7ac6c3d5be3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, impersonating a BIOS update to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=asus+m3a78-em+bios+update
    • https://zojunakalej.weebly.com/uploads/1/3/2/6/132682915/solenebikuv_fabumuraro.pdf
    • http://fidumanodabimor.22web.org/algebra_2_textbook_mcdougal_littell_california.pdf
    • http://alcexpress3.xyz/bebukitasepowasfoer.pdf
    • http://aycotoro6.xyz/bisopevotmanp6.pdf
    • http://power-guard.shop/your_beauty_mark_dita_von_teeseaht58.pdf
    • https://dovomarolod.weebly.com/uploads/1/3/0/9/130969455/8c6a406b90fa7a.pdf
    • http://logmeinnow.xyz/amazon_driving_jobs_orlandobx46c.pdf
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/metolukuxosuxi.pdf
    • http://extraterrestrials.space/44193921288jcc5w.pdf
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/litametakefo_podavoduv_semutupipuz_dojox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_edfd12083d794b52a9393bc9cc912b3b.pdf?index=true
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_9dec0621a4c14ebca58d0c6be15a746b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab7259b5-32e3-4573-b3cc-90afb037a155/xibel.pdf
    • http://dafevuzadolax.epizy.com/55879389670.pdf
    • http://gazepofibugas.epizy.com/what_are_the_steps_in_planning_and_explain.pdf
    • https://s3.amazonaws.com/jovekus/name_change_affidavit_format_in_marathi.pdf
    • https://uploads.strikinglycdn.com/files/e21f570c-e21b-4743-bf00-a9d5d5b79b89/brinkmann_smoker_replacement_parts.pdf
    • https://uploads.strikinglycdn.com/files/acfc0904-f1f4-4ae4-b290-47eee2a89028/xoxofufiterufawilo.pdf
    • https://s3.amazonaws.com/jidosatikim/burgundy_high_heel_platform_shoes.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_off0000d8b1.bin
e38be33cf6307163d0beafed001e3a8004bb8e8d992ed06202f1db0e6707dafd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 5576 bytes
font_01_sfnt_off0000eb97.bin
3313f8957911ab53b087af15595a8d08e36e104cbc0fd6f5df3100b77f8dd3e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10448 bytes

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