Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3f9f254a8c713b…

MALICIOUS

PDF

99.0 KB Created: 2021-03-31 03:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ebde094e35ab07c6b6ca3839f8db0b SHA-1: 751d51767681386e7750b4137c544fb7eea65479 SHA-256: 8b3f9f254a8c713becb950c2b64cd062696c02b072f6f8bb1c750f2f4aa7a255
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=freightliner+m2+radio+antenna+location
    • http://fogejebimo.scienceontheweb.net/porsche_buyer_s_guide.pdf
    • http://tricitysikhs.com/is_onyx_a_good_pokemonavz7u.pdf
    • http://sputnews.com/what_is_wrong_with_rosemarys_babygqfr2.pdf
    • http://xokebidukefu.getenjoyment.net/autoestima_en_los_nios.pdf
    • http://shoop-fp.ru/xefunimaramaxrvdlp.pdf
    • http://cosmeteca.com/4800959222lztyz.pdf
    • http://defi-bet.world/jump_zone_15_ft_trampoline_assemblybb0kv.pdf
    • http://zutumufedige.getenjoyment.net/51401499135.pdf
    • http://botefedej.sportsontheweb.net/baudelaire_poesie.pdf
    • http://jawixogu.mygamesonline.org/gubaforej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_4521bf164a65412fa839bb053c306f24.pdf?index=true
    • https://s3.amazonaws.com/kefiperizonofu/87932119702.pdf
    • https://s3.amazonaws.com/watajive/effective_half_life_equation.pdf
    • https://s3.amazonaws.com/goneduzum/wings_of_fire_book_13.pdf
    • https://s3.amazonaws.com/tizowodifi/bondhon_movie_jeet.pdf
    • https://854397d5-242e-4836-9f1e-4d22a5541959.filesusr.com/ugd/88a329_dd02c3dd57f54f819602891dfd47ef7b.pdf?index=true
    • https://s3.amazonaws.com/pexodugosa/6382038080.pdf
    • http://nosawakudik.myartsonline.com/autodesk_123d_design_tutorial.pdf
    • https://s3.amazonaws.com/ronenitevodo/51701714030.pdf
    • http://tavamikilav.myartsonline.com/abbyy_transformer_mawto.pdf
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_09559a40640b4d0a999189c040f88318.pdf?index=true
    • http://fataragoreb.myartsonline.com/80322891977.pdf
    • https://s3.amazonaws.com/gagotaniwipure/sobezubikebezukifemuja.pdf
    • https://s3.amazonaws.com/watajive/what_did_the_plant_say_in_little_shop_of_horrors.pdf
    • http://xemigososefof.atwebpages.com/vermont_castings_resolute_1979.pdf
    • http://tuminexozuvino.atwebpages.com/engineering_mathematics_gate_notes_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144aa.bin
4be1e13c98a7ca7f3e09bc8c8b866d720beeaf7af487ccc1d5141f8e7ee777b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144AA 5260 bytes
font_01_sfnt_off00015661.bin
ecaf9f552f5b43586535002240dbe86d9e3adad8832440ebc93431e53a5d1047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15661 11844 bytes

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