Malicious PDF — malware analysis report

Static analysis result for SHA-256 852de4835ba34f9e…

MALICIOUS

PDF

98.2 KB Created: 2021-03-17 03:21:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 32695e8dfc63f0c57a1ebd27d2fd4959 SHA-1: d62083f72c11c2e9acb4eaf8d9d9a3f35290ed26 SHA-256: 852de4835ba34f9ee250a182184b5003cc3a7d9679fc94c0b06354d2530aed24
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to distribute traffic to various potentially malicious sites. While no scripts were extracted, the presence of many external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/123?utm_term=types+of+animal+cell+culture+media+pdf PDF link annotation
    • https://cdn.sqhk.co/wubukuxivupe/hegfIjd/telegram_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/hdKghW1/flags_of_the_world_game_debenhams.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/7883927.pdfIn PDF document text
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/vomubarozetafiriva.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/8jbcfjj/cooking_fever_hack_2020_apk.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/zokugimirazepuwaxewij.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/kupejoxufejerirujeg.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/maquina_de_coser_singer_brilliance_6180_manual_en_espaol.pdfIn PDF document text
    • https://wagalivo.weebly.com/uploads/1/3/0/8/130814328/gejifapawexulo.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/fabilatupixotixumu.pdfIn PDF document text
    • https://wivaralizufijol.weebly.com/uploads/1/3/1/4/131483386/pokoniji.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/likixagefafotu.pdfIn PDF document text
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/5677761.pdfIn PDF document text
    • https://cdn.sqhk.co/bezugisav/jjgeQZD/50969198578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegugoleta.onlinewebshop.net/vamas.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/distress_tolerance_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/bezetak.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/aurelius_meditations_book_2.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_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0001413d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413D 5352 bytes
SHA-256: 9ba06dd9cfee048487d2554b9f535512060c6a796f3df94e9bfa9dfbfdb40c33
font_02_sfnt_off00015361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15361 11780 bytes
SHA-256: 32b658cde71c1fd8e9ed9749630df6383c5385216833668a1f20219074a70ebb

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