Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aded4a87bd2d57f…

MALICIOUS

PDF

73.2 KB Created: 2021-05-09 06:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 144255af847b50b6c9df30467186960e SHA-1: 5059882f97675a407028bccc410869bbf4cd4320 SHA-256: 4aded4a87bd2d57fa3b32eff388ce7f28a5fcb9a839f451ded6a2d6e97519f99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/strik?utm_term=how+do+you+administer+medication+through+an+ng+tube PDF link annotation
    • https://cdn.sqhk.co/gutifusuf/adginzu/battery_operated_garland_with_white_lights.pdfIn PDF document text
    • https://dadurafiwazozu.weebly.com/uploads/1/3/4/7/134768329/fawalok_pesepikevofi.pdfIn PDF document text
    • https://cdn.sqhk.co/remudejifi/Hggijji/chip_and_dale_game.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/xasidagunulol-towasesijibugu-mezipigix.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/investigacion_cualitativa_en_psicologia_gonzalez_rey.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/audio_books_with_files.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/hdPgjc0/mars_vr_game.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/marowuxedegurezoka.pdfIn PDF document text
    • http://jixewelo.scienceontheweb.net/bearing_selection_chart.pdfIn PDF document text
    • http://xowanopumug.22web.org/en_la_mitologa_griega_diosa_del_inframundo.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/91jepgj/switch_pros_tacoma_install.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e74d023-209b-4ed7-9eb6-0b1e31c0c3f2/fewapunibima.pdfIn PDF document text
    • http://pebimomedunuzux.epizy.com/zodamesumerarotumumamo.pdfIn PDF document text
    • http://dodujorumapide.epizy.com/maytag_washing_machine_troubleshooting_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80b481e-287c-4c00-90ae-b16260fcc051/10162018263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68460936-9891-489c-92e3-81f60f218249/18103620878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17386dbe-3c71-4055-9669-86a24e4bb966/82028748384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b41151b-3d28-450a-9aa8-cf75c995b6f2/what_are_some_important_listening_skills_when_communicating.pdfIn PDF document text
    • http://tuvivitir.rf.gd/nie_boska_komedia_sprawdzian.pdfIn PDF document text
    • http://vuripuwap.epizy.com/fofazo.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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 5616 bytes
SHA-256: e3942e08b354e6f469929da7740514582b10a010175d942ccf45e3b5427c1d85
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10040 bytes
SHA-256: 21d0b7468c0ffaf45ae1fff117cd694cdadcc61b196e0b10373baeb650d6cc2d

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