Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f388a8cbebda7a…

MALICIOUS

PDF

163.4 KB Created: 2021-03-29 00:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c3525f9a6cf65818a0c5e4e515662058 SHA-1: ad0dcbd4a0e2cdbe640fd47429f921caa952da0b SHA-256: a2f388a8cbebda7a899ffb197d274774ce47f111d1dd932a167a880fa80b5ec3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier output strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'film battle royale 2000' and application metadata, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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://soxebez.ru/123?utm_term=film+battle+royale+2000 PDF link annotation
    • https://vegalatunom.weebly.com/uploads/1/3/0/7/130776393/209ed.pdfIn PDF document text
    • https://kajukijuxuvame.weebly.com/uploads/1/3/5/3/135329863/bedovagekefifupat.pdfIn PDF document text
    • https://gebiworopefibo.weebly.com/uploads/1/3/4/5/134583098/47518.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/puposepigip.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/xurorewage.pdfIn PDF document text
    • https://jasumiwadujavik.weebly.com/uploads/1/3/2/7/132741590/3599964.pdfIn PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/c13731b8ce39.pdfIn PDF document text
    • https://fegoparowewara.weebly.com/uploads/1/3/4/3/134321013/b7a75d99632670.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/fumex-fifalan-rerodo.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/bubutipisawika-zitigo.pdfIn PDF document text
    • https://wotutokope.weebly.com/uploads/1/3/5/3/135315373/tumiwurisafizasifaz.pdfIn PDF document text
    • https://rawubewo.weebly.com/uploads/1/3/1/4/131405976/63866521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_6b92d144a07a4769ac0a1dd89344a4be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/radomazivomixowu.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_d2a21d0dd659432f8d3632479c8b2835.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_a3742ef24a754f808cae0f9e1eb34fdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/lg_smart_inverter_microwave_error_codes.pdfIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_38acea6deb594a3eb852a306d187987f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/how_to_put_vicks_vapopads_in_humidifier.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_13cd113e262c4d77a7aef0750cf0f305.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_ffdf5e456a994da2a7f33a63b61646f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/40408839850.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
stream_004_off0001ade4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1ADE4 49012 bytes
SHA-256: ba12a7d00bdac74d6552026527bcd1523b9992276abb541d4c75248a829c8ff4
font_01_sfnt_off00024324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24324 5124 bytes
SHA-256: ba4488d8d30f382a41c2b48dd822133e1c030ea42580ac765ea73e7aec5b5858
font_02_sfnt_off00025483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25483 12996 bytes
SHA-256: 41945f1c37071f53f67d5593a6c13d7e9f5c35e9d462b1cb67ca1af4f43cd97f