Malicious PDF — malware analysis report

Static analysis result for SHA-256 39768d6c44c2eb9b…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 04:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f70df1b7926ea1ec6412edeeb4790c63 SHA-1: 95ecf792741c06e3cb61ac0dfb5a9c260416477f SHA-256: 39768d6c44c2eb9bfce9ed001f225694809557fa7aed356e983496559ccf1b82
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains a title related to periodic table elements, likely a lure to encourage clicks on embedded links. The presence of numerous external URIs, including those on disposable hosting, suggests a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself likely facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/strik?utm_term=que+elementos+de+la+tabla+periodica+son+solidos+liquidos+y+gaseosos PDF link annotation
    • https://cdn.sqhk.co/lagolipumepi/iigejgV/domovineme.pdfIn PDF document text
    • https://cdn.sqhk.co/tawavumazo/ujvjcje/taptap_send_ceo.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/85094474060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_60066aba0b354.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/ifhhghm/88360174579.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/fqpJgdB/doom_eternal_levels_ranked.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/nigimejejazaladewuluror.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601c60883d9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_6036ad85a565a.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/ijkighe/9289767234.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/computer_network_technician_trade_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7a060034b3ed46db8cf5a0e61cd5be10.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_80d6e9a4bde5434b836b966663bb1f75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82c10eb-123d-4bde-855f-5fcb011f0c14/jeladixejifekazizoluxal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2108a57-c2ca-4c78-b6a5-e3007470ec90/lanudewatujab.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/the_book_of_beasts_t_h_white.pdfIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_b2e05a62097140cfb630c8b5e584798a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/bifulipaboz.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_6b69590731864c419b374354f0db6693.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57218c12-5c06-49ec-9dc1-2a5696105416/tuesdays_with_morrie_life_lessons_quotes_with_page_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f5fff0-7d42-4c15-aa84-122afd0e74fc/77341104123.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/dukunitirikaziludevar.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/zoxiduzejusimufitikiwex.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_473b3a0b8aef407abdaeab406ec80213.pdf?index=trueIn 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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 5824 bytes
SHA-256: 934fcb696ef731e5744447964fba0acb5cf2df98d8372ab813e2793e03839a9d
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 12024 bytes
SHA-256: 54c3d46dc657d36a3a4e73c2ec06874c359031ddd1a51d226ec9f32c1a4a012d