Malicious PDF — malware analysis report

Static analysis result for SHA-256 629e4d899e1bf5ab…

MALICIOUS

PDF

77.7 KB Created: 2021-05-07 23:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e647eac3937c1837f81e7f5e809d4455 SHA-1: 969191a0e6389494e30e6eb7dd97da36adc12ff1 SHA-256: 629e4d899e1bf5abd8cca08cc607bcd93c56ef322849aacc3a85c6aa631d886f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://pelibifir.ru/strik?utm_term=diet+plan+to+lose+weight+for+breastfeeding+mothers', is directly embedded and suggests a lure related to diet plans. Another URL, 'http://pikawin.rf.gd/92581079682.pdf', is also identified as a potential entry point for further malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=diet+plan+to+lose+weight+for+breastfeeding+mothers
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5fe3e8a84988f.pdf
    • http://maxafutolo.iblogger.org/paraphrasing_sentences_examples.pdf
    • http://lemakomude.sportsontheweb.net/web_development_tutorial_book.pdf
    • http://taniduvubaz.22web.org/tendinitis_aquilea_tratamiento_fisioterapia.pdf
    • http://bijowuxupolapi.sportsontheweb.net/blank_bingo_board_template.pdf
    • https://cdn-cms.f-static.net/uploads/4383579/normal_602e327b273e3.pdf
    • https://ruxakadun.weebly.com/uploads/1/3/0/7/130739963/7276387.pdf
    • https://tedetoxemerul.weebly.com/uploads/1/3/5/3/135311624/7073520.pdf
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/wedirali-wodunij.pdf
    • https://cdn-cms.f-static.net/uploads/4407102/normal_603aae13b0268.pdf
    • http://jigapenufi.medianewsonline.com/how_to_start_gas_fireplace_without_key.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pikawin.rf.gd/92581079682.pdf
    • https://uploads.strikinglycdn.com/files/dc2eabdd-9a56-4513-9b52-5ca0e4a8bb72/soundarya_lahari_telugu_mp3_song_free_download.pdf
    • https://uploads.strikinglycdn.com/files/819f2698-7b97-4033-9c5d-0801148be5b3/39652660826.pdf
    • https://uploads.strikinglycdn.com/files/f9e0e73f-7746-4d8f-8806-77d2b0dc0030/71915236734.pdf
    • http://jopipada.epizy.com/genetic_algorithms_in_java_basics.pdf
    • https://uploads.strikinglycdn.com/files/f9cd8d0f-684a-45aa-be2b-290ea22cdbf1/memura.pdf
    • http://wudemexa.myartsonline.com/advances_in_science_and_technology.pdf
    • https://uploads.strikinglycdn.com/files/e944ccb0-dd7b-4546-8710-cdb78f73a02b/tumuf.pdf
    • https://uploads.strikinglycdn.com/files/0e8cd7ec-4b46-4a98-9392-b22ba316fa78/how_to_do_stoichiometry_mole_to_mole_problems.pdf
    • http://radoneg.rf.gd/pdf_akuntansi_perusahaan_dagang.pdf
    • https://uploads.strikinglycdn.com/files/f2d65ad2-a7b7-482e-9896-a86c576d0d5a/eric_ries_lean_startup_summary.pdf
    • http://xijewixevav.onlinewebshop.net/alveolos_anatomia_y_fisiologia.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_off0000f01b.bin
dcec70dcf402ace4b06d68bb337f50db749d11e2fef953dfef32a91f30342d35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 5688 bytes
font_01_sfnt_off00010358.bin
c0dc1e7469d332091b9b8401e0881bc50aee5f94c528182f0b6c05a803916f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 11068 bytes

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