Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc756f6bcebbc15…

MALICIOUS

PDF

73.2 KB Created: 2021-03-03 00:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f75a7d70fdea78ea8412f0067605137c SHA-1: 85aba46a3fcf73dee7a9fa164474ba35850927aa SHA-256: 5bc756f6bcebbc152c91ae5fd50df3dde8a49b93a7524f1b00477417506cfa7e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to job searches, suggesting a phishing lure to drive users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=school+nutrition+jobs+near+me In PDF document text
    • http://viniveba.mywebcommunity.org/rotagareromevodofobuxodi.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/why_is_my_roku_tv_playing_sound_but_no_picture.pdfIn PDF document text
    • http://i12tws.website/43359665515xwcim.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/lopidizup.pdfIn PDF document text
    • http://rm-swis-mine.com/sex_education_season_3a5fb3.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/what_is_the_etiquette_for_mother_of_the_groom_dress.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/67086156798gb741.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/1597534443ivsp1.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/73568482d998ea5.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/lifipiretagaje.pdfIn PDF document text
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/8788649.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/hp_photosmart_7525_printer_user_guide.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/41126940668.pdfIn PDF document text
    • http://boost-shop.xyz/ejemplo_de_un_ensayo_argumentativo_corto_con_sus_partesmvq30.pdfIn PDF document text
    • https://wurivebufe.weebly.com/uploads/1/3/0/8/130874680/6a641952e843eee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japinoxizidunub.myartsonline.com/tosofiwotunaturinu.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/79015638589.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 5356 bytes
SHA-256: f22639b713ad52a30fe275952f8a4f07a2b2ac4ab43fbaa1d874b84ef08546a1
font_01_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 10208 bytes
SHA-256: 522fc2d2fcf1105e89c216fc3bc3c7a740a77b2b395aacf92b3d2dbf79a4df2c

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