Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bfa5295d3a3cd0…

MALICIOUS

PDF

85.0 KB Created: 2021-04-04 01:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 81fb766fe8b17d06fb95c655c6bf248c SHA-1: 581f480212ac68a2c73a0d91808a5814960dadd1 SHA-256: b2bfa5295d3a3cd0a2125bd472e1cff1a5ff1d352503e486b68a62e9b7a578e7
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple 'unknown' reputation URLs strongly suggest malicious intent. The ML classifier and ClamAV detection further support this assessment, flagging the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://zajinet.ru/strik?utm_term=neural+network+in+matlab+code+example PDF link annotation
    • http://dusejetiwogodad.getenjoyment.net/sudepa.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/7idYhi6/general_electric_stock_today.pdfIn PDF document text
    • https://cdn.sqhk.co/pukojawutev/gi3AidH/88863437294.pdfIn PDF document text
    • http://tejifepubodol.iblogger.org/siruxesi.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/iblibjb/chicago_manual_of_style_reference_page_example.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/hajIcia/glory_of_generals_2_mod_apk_revdl.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/jexiwo.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/whirlpool_cabrio_5.0_washer_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widurema.epizy.com/takeuchi_tb290_specs.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/xaxidirekadajetiv.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/gameboy_color_emulator_android_apk.pdfIn PDF document text
    • http://duxurulokij.epizy.com/format_factory_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/19819129004.pdfIn PDF document text
    • http://wosekamilos.epizy.com/candombl_de_angola_rezas.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/2_for_5_at_burger_king_2020.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_e35443df49264411a5558ce261dc3be3.pdf?index=trueIn PDF document text
    • http://lowepasonadoji.rf.gd/baahubali_audio_songs_free.pdfIn PDF document text
    • https://7e62deb9-9b1a-4e2d-8b60-9a8f762ee201.filesusr.com/ugd/1f553f_3ad14b1996a143aca571ad2ce2853a87.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_8222a9e1b68f4a27860bbc1bce49a06c.pdf?index=trueIn PDF document text
    • http://sosibozipez.rf.gd/zegivesugus.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/kegexanikinibiwesire.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/the_ministers_black_veil_summary_video.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/51181593164.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_692e2936d9dd43a4ba0c6be1719e32c7.pdf?index=trueIn PDF document text
    • http://buvifaxakekise.rf.gd/17251279087.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_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 5372 bytes
SHA-256: 06d4c8656751057d00e22a5e684a4dc7ad9a0dda95fdccdf02f7231635507deb
font_01_sfnt_off00011cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 12164 bytes
SHA-256: 8a64595fcff8ce8dcb93cc0007d060126b48f9eea13c627bf79de3b63aab9714

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