Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad54b399e087d0b…

MALICIOUS

PDF

73.5 KB Created: 2021-03-20 16:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06114881c39f5ce8ef75c3914c40db17 SHA-1: 998936646782790d467f18a63b7c7ed6b89c5131 SHA-256: 6ad54b399e087d0b152c7c58c08d8fc3293d3b8e53494f17c28396276796379b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=simplygo+mini+service+manual In PDF document text
    • https://logesili.weebly.com/uploads/1/3/5/3/135389335/giwivud.pdfIn PDF document text
    • http://gnfcns.info/death_note_movie_2020b7tqj.pdfIn PDF document text
    • http://logusubunovad.22web.org/estimation_of_blood_urea_by_diacetyl_monoxime_method.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5fe42cfc197e1.pdfIn PDF document text
    • https://gomibabojusul.weebly.com/uploads/1/3/1/4/131483197/kabonuf.pdfIn PDF document text
    • http://levantemosaic.com/roxozipudozuw77cq.pdfIn PDF document text
    • http://pe50off.info/bututexofivijuvenolsg46v.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/4038340.pdfIn PDF document text
    • http://itsamorem.com/jezinaposinuvirigagatonay9yk4.pdfIn PDF document text
    • http://foyou.store/feng_shui_flying_stars_january_2020ddz7v.pdfIn PDF document text
    • http://topdiscount.pro/tanewodogotigixuzal97a.pdfIn PDF document text
    • http://instapriz24.site/never_ending_story_boohwal_english_lyricsn5t8f.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/bbf765dc5ee5.pdfIn PDF document text
    • https://baloxojiregape.weebly.com/uploads/1/3/4/6/134685367/luxib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502175/normal_60532ee53ab2c.pdfIn PDF document text
    • http://nubigawe.22web.org/blank_space_audio_song_free.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/muvazi/jibojunumulegotojaf.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/rupugofixu.pdfIn PDF document text
    • http://silutopedap.rf.gd/jubajukuxitojazigew.pdfIn PDF document text
    • http://vowaxuf.rf.gd/arbol_de_la_vida_cabalistico.pdfIn PDF document text
    • http://pebafuduzuxifa.rf.gd/60442226781.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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 5520 bytes
SHA-256: a29ffa8ba9dc6d42949732c6f806189862f3f45a9889c02d08baa3a2238a978b
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10644 bytes
SHA-256: 2a3bf021719d28f93f227e95cf2c087f25544c6ead8dbcfedfe4a40afbe9b298

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