Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadf50d464df7466…

MALICIOUS

PDF

83.8 KB Created: 2021-04-17 15:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a686205d89b6e8c83a567bb8f6a0aa5 SHA-1: b8c39e891bb5adc9a5b113815d1b925abd78811a SHA-256: fadf50d464df7466b4f26796ce59bd5056d49e36930a9d700e650e7d6515d272
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 SEO-optimized PDF files, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=how+to+take+apart+my+keurig+mini
    • http://zenaxudoriw.mypressonline.com/basic_grammar_english.pdf
    • http://islemleriniz.org/1707128988btt1d.pdf
    • http://agreevudb.rest/siemens_plc_program_for_vending_machineywwuj.pdf
    • http://zomixuxoluzijum.mywebcommunity.org/free_download_holy_bible_niv.pdf
    • http://raponikidosal.getenjoyment.net/74293026000.pdf
    • http://promoocaoameericanas.com/i_am_who_you_say_i_am_sermongzfkl.pdf
    • https://cdn.sqhk.co/xefilelo/giilzic/pufezisosalu.pdf
    • http://extra-fon.ru/what_kind_of_oil_does_a_2015_toyota_sienna_useen1bv.pdf
    • http://ritual-venki.online/zekiwugotigwyzaw.pdf
    • https://cdn.sqhk.co/gukokefa/fghkjcK/tp_link_archer_vr600_manual.pdf
    • https://cdn.sqhk.co/fuxilumevo/hgib0jc/ca_lottery_scratchers_best_odds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_0355ecdf87564a76a1914768211b592d.pdf?index=true
    • https://s3.amazonaws.com/nuxulikiwab/95059815701.pdf
    • https://s3.amazonaws.com/kifutizijebuj/bose_universal_remote_app.pdf
    • https://s3.amazonaws.com/lijopavexanuse/pediatric_acute_lymphoblastic_leukemia_guidelines.pdf
    • https://s3.amazonaws.com/lizuseguwix/singer_sewing_machine_contact_number_uk.pdf
    • https://s3.amazonaws.com/sakaburepagase/jutimufawazokexizutuketi.pdf
    • https://s3.amazonaws.com/vukusa/sounan_desu_ka_episode_8.pdf
    • https://s3.amazonaws.com/jaxesabi/mahabharat_barbareek_movie.pdf
    • https://70a023e4-b173-4b34-8ac5-854d526a16b0.filesusr.com/ugd/5aec30_09dc6f6a8a394ff69f41d887e06c6161.pdf?index=true
    • https://s3.amazonaws.com/sifawekujiki/zulajiwukuxokobalazu.pdf
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_b73cf158a0224999884c22bfe12e89a9.pdf?index=true
    • https://s3.amazonaws.com/fumiposamisur/ramawafisiro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdee.bin
d18d33c5e89fdc84419e49d8a5a21dfadef855ce5e5e355c5a1d682ddb60399c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 5028 bytes
font_01_sfnt_off00010f0a.bin
59fca82ab9fa9c9b11000f75bfb7937a797b76b2218cf37f1f7238e686d1f067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 10304 bytes
font_02_sfnt_off0001323d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1323D 4324 bytes

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